问题补充:
--What do you think of it?
--I think it is a thing of importance that it done soon.
A. is
B. is to be
C. be
D. to be
答案:
A. is
B. is to be
C. be
(答案→)D. to be
解析:can/could not +have done用于疑问句或否定句时,表示对过去情况的推测.表示不可能作过某事。
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