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 + 動(dòng)詞完成式”的意思是：本來(lái)不必做某事，但實(shí)際上做了。上句意思是“你本來(lái)不必告訴他這個(gè)消息的，因?yàn)樗?當(dāng)時(shí))已經(jīng)知道了”。注意，句中 knew 為過(guò)去式。
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