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  3. As far as I know, she was asked to look after her sick mother, so she______the party-yesterday.

As far as I know, she was asked to look after her sick mother, so she______the party-yesterday.

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问题 As far as I know, she was asked to look after her sick mother, so she______the party-yesterday.
选项 A、mustn’ t have taken part in
B、shouldn’ t have taken part in
C、needn’ t have taken part in
D、couldn’ t have taken part in
答案D
解析 must have done表示过去肯定做了某事，是对过去发生事情的肯定推测，其否定形式不用mustn’t；shouldn’t have done表示过去本不应该做某事而实际上却做了；needn’t have done表示过去本不必做某事而实际上却做了；couldn’t have done表示过去不可能做了某事，是对过去发生事情的否定推测。根据so之前的she was asked to look after her sick mother可知，她不可能去参加昨天的派对，是对过去发生事情的否定推测，所以应用couldn’t have done的形式。故选D。
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