You should have put the milk into the ice-box; 1 expect it_____ undrinkable.A、be

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问题 You should have put the milk into the ice-box; 1 expect it_____ undrinkable.

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

答案 C

解析从句意分析，牛奶已经变质，不能喝了，属过去发生的动作对现在造成影响，再加上by now是现在完成时的典型时间状语，故选C。

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