He writing the paper now. He hadn’t written a single word when I left him ten mi
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He ____ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.
A. shouldn’t be B. can’t have finished
C. can’t be D. mustn’t have finished
试题答案
B
解析:
查情态动词。“can’t have + 过去分词”表示对过去情况的可能性推测，此处意为“不可能已完成”。