题目内容
【题目】—Catherine. I have cleaned the room for you.
—Thanks. You________it. I could manage it myself.
A.needn't do
B.needn't have done
C.mustn't do
D.shouldn't have done
【答案】B
【解析】“needn't have+v.-ed形式”表示“(过去)没有必要”,“I could manage it myself”表明没有必要帮助把房间打扫干净。
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