You should have put the milk in the refrigerator.I expect it________undrinkable.

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问题 You should have put the milk in the refrigerator.I expect it________undrinkable.

选项 A、became
B、has become
C、had become
D、becomes

答案B

解析根据题目意思，牛奶并没有被放到冰箱里，因此可能变质，导致不能喝。后半句强调的是对现在造成的结果，所以用现在完成时，故选B。

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A类竞赛（研究生）

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