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

admin2012-06-19  37

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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