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.--I sent him a most interesting story book  by mail this morning.
--You____so; he's coming tomorrow morning.

A．needn't do B．needn't have done C．don't need to do D．didn't need do

B

解析試題分析：句意：--今天早上我用郵件給他發(fā)了一個非常有趣的書。--你不必這么做，明天早上他就來了。Needn’t have done“過去本沒有必要做，而做了”，是虛擬語氣，A. needn't do和 didn't need do都是過去沒有必要做， C.don't need to do 現(xiàn)在沒有必要做，所以選B。
考點：考查情態(tài)動詞和虛擬語氣

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