2. 外语
  3. You should have put the milk in the icebox; I expect it ______ undrinkable by now.

You should have put the milk in the icebox; I expect it ______ undrinkable by now.

admin2010-04-24  29
问题 You should have put the milk in the icebox; I expect it ______ undrinkable by now.
选项 A、became
B、had become
C、has become
D、becomes
答案C
解析 动词时态。should have done表示过去应该做却没有做之事；by now这个时间状语说明应该使用现在完成时。
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