1.(C) I doubt _____ it will be a sunny day tomorrow .
(A)when
(B)what
(C)whether
(D)about
请问为什么不能选A?
2.(A) Jason looked out of the window, ______ when it would clear up so that he
could go play outside .
(A)not knowing
(B)didn't know
(C)he didn't know
(D)not knew
请问此题是考哪个文法观念?
3.(D) MY brother doesn't study ____ the day before a test .No wonder he can't
do well on the teats.
(A)for
(B)when
(C)during
(D)until
请问为什么不能选C?
感谢大家!!