You should have put the yogurt into the fridge, I expect it ______ undrinkable by now.

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问题 You should have put the yogurt into the fridge, I expect it ______ undrinkable by now.

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

答案C

解析 从句意分析,酸奶已经变质,不能喝了,属于过去发生的动作对现在造成的影响,再加上by now 是现在完成时的典型时间状语,I expect=I think= I suppose 意思为我想、我认为。故选C。
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