You should have put the milk in the ice-box; I expect it______undrinkable by now

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问题 You should have put the milk in the ice-box; I expect it______undrinkable by now.

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

答案 C

解析此处用现在完成时，是因为句中已给了典型的与现在完成时连用的时间状语bynow。

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