题目内容

He ____ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.
A．shouldn’t beB．can’t have finishedC．can’t beD．mustn’t have finished
B
考查情态动词。“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”。
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