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You _____ him the news; he knew it already.
A.needn’t tellB.needn’t have told
C.mightn’t tellD.mightn’t have told
B
“needn’t + 动词完成式”的意思是:本来不必做某事,但实际上做了。上句意思是“你本来不必告诉他这个消息的,因为他(当时)已经知道了”。注意,句中 knew 为过去式。
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