各位高手好
小弟有二个问题想请教
第一个:
32.
The Chicago and Calumet Rivers originally flowed into the St. Lawrence by way
of Lake Michigan, but having been redirected by constructing canals so that
the water now empties into the Mississippi by way of the Illinois River.
(A) Rivers originally flowed into the St. Lawrence by way of Lake Michigan,
but having been redirected by constructing
(B) Rivers had originally flowed into the St. Lawrence by way of Lake
Michigan, but they have been redirected by constructing
(C) Rivers, which originally flowed into the St. Lawrence by way of Lake
Michigan but have been redirected by the construction of
(D) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan,
but having been redirected by the construction of
(E) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan,
have been redirected through the construction of
删到剩BE挣扎
为何B的过去完成式不好??
答案是E
第二个问题:
43.
Although ice particles in the upper atmosphere benefit Earth in that they
reflect and absorb solar radiation, acting as a global thermostat and thus
keeping Earth from either burning up or freezing over, they also accelerate
the destruction of the ozone layer by reacting with chlorofluorocarbons
(CFC's).
(A) acting as a global thermostat and thus keeping Earth from either burning
up or freezing over, they also accelerate
(B) acting as a global thermostat and thus keeping Earth either from burning
up or freezing over, while also accelerating
(C) act as a global thermostat and thus keep Earth from either burning up or
freezing over, while also accelerating
(D) they act as a global thermostat that thus keeps Earth either from burning
up or freezing over, even though it also accelerates
(E) they act as a global thermostat to thus keep Earth from either burning up
or freezing over, but they also accelerate
答案是A
但为何A的acting不会错误修饰到solar radiation
这个问题困扰我很久了
因为像下面这题
42.
During the same period in which the Maya were developing a hieroglyphic
system of writing, the Aztec people also developed a written language, but it
was not as highly sophisticated as that of the Maya and was more pictographic
in nature.
(A) but it was not as highly sophisticated as that of the Maya and was
(B) but it was not as highly sophisticated as the Maya, being
(C) but, not as highly sophisticated as the Maya's, was
(D) not as highly sophisticated as that of the Maya, however, being
(E) not as highly sophisticated as the Maya's however, it was
D选项中的being修辞笔记说会错误修饰maya
所以不选
那42和43的分词究竟差在哪里
为何一个可以选一个不能选??
希望请各位大大赐教
谢谢~~