在网络看到这题
The surgeon general’s report ______ that smokers create health risks for near
by nonsmokers has encouraged companies to promote smoke-free work environments
.
(A) asserting
(B) asserts
(C) asserted
(D) has asserted
答案是A
想请问为什么不能选择B当作
The surgeon general’s report ______ that 的动词呢