空调启动器怎么安装:Shall I tell Tom about it?No, you__.I've told him already.A,shouldn't B,needn't

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为什么??????????????????

B

I've told him already.我已经告诉Tom了.说明你没有必要再告诉Tom.

所以用
needn't没有必要

shouldn't不应该(不和题意)

I shall tell him the truth, ______ . Shall I tell Tom about it?No, you__.I've told him already.A,shouldn't B,needn't When I ( ) him,I shall tell him the result. --Shall I invite Tom to my party?---Yes,it'll be nice if you _. What shall I do? What shall I do????????? What shall I do? what shall i do? I shall的缩写 WHAT SHALL I DO ？