Peter pulled up his collar so high that you_______have seen his head from behind if you had been there. ( )

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问题 Peter pulled up his collar so high that you_______have seen his head from behind if you had been there. (    )

选项 A、wouldn’t
B、mustn’t
C、couldn’t
D、shouldn’t

答案C

解析 句意:彼得把衣领拉得如此高,以至即便你当时在那里,从后面也看不到他的脑袋。从句意判断,填空处表达的是一种能力,前面用的是过去时,后面也应用过去时。could是can的过去式,表能力时是非推测意义。答案为C。
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