-----I didin't give him a hand when he was in trouble.-----A.should B.ought to haveC.ought to doD.should do为什么选B
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![-----I didin't give him a hand when he was in trouble.-----A.should B.ought to haveC.ought to doD.should do为什么选B](/uploads/image/z/14520856-40-6.jpg?t=-----I+didin%27t+give+him+a+hand+when+he+was+in+trouble.-----A.should+B.ought+to+haveC.ought+to+doD.should+do%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89B)
-----I didin't give him a hand when he was in trouble.-----A.should B.ought to haveC.ought to doD.should do为什么选B
-----I didin't give him a hand when he was in trouble.
-----A.should B.ought to haveC.ought to doD.should do
为什么选B
-----I didin't give him a hand when he was in trouble.-----A.should B.ought to haveC.ought to doD.should do为什么选B
outht to have done sth.表示“本该做某事(却未做)”,符合题意.
表示过去应该做 但是没有做