--What do you think of it?--I think it is a thing of importance that it done soon.A. is B

发布时间：2020-08-17 12:24:38

--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

网友回答

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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