He ____ writing the paper now. He hadn’t written a single word when I left him t
题型：不详难度：来源：
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 |
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答案
| B |
解析
| 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”。 |
举一反三
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