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

解析第一句中的should have put是对过去事实的虚拟，表明“并没有放进冰箱”，因此，后句表达的意思是“它现在已经变得不能喝了”，用现在完成时表过去某一行为造成的结果。

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A类竞赛（研究生）

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