You should have put the milk into the icebox, I expect it undrinkable.A. becameB. had bec

You should have put the milk into the icebox, I expect it undrinkable.
A. became
B. had become
C. has become
D. becomes

A. becameB. had become(答案→)C. has becomeD. becomes解析：本句的意思是：你本该把牛奶放到冰箱里，我想现在这牛奶不能喝了。本句的难点是：从句意分析，牛奶已经变质，不能喝了，属过去发生的动作对现在造成影响，再加上by now是现在完成时的典型时间状语，故选[C]。

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