Look at the mess the boys made! You _______ have taught them how to behave themselves.
A．mustB．may C．canD．should
D
考查情態(tài)動(dòng)詞。must 必須，may 可能，can 會(huì)，should 應(yīng)該，句意：看孩子們弄得一團(tuán)糟！你本應(yīng)該教給他們?nèi)绾问匾?guī)矩。should have done 本應(yīng)該做某事而實(shí)際上沒有做，所以選D。 
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