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

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

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问题 You should have put the milk into 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 考查时态。从句意分析，牛奶已经变质，不能喝了，是过去发生的动作对现在造成的影响，而且by now是典型的现在完成时态的标志，故选C。
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