单项选择题

You have put the milk in the ice-box; I expect it（）drinkable by now.

A. became
B. had become
C. has become
D. becomes

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单项选择题

A. No one claimed responsibility for the accident.
B. A bomb was found in the train.
C. A terrorist group was responsible for the accident.
D. No one knew why the train derailed.

单项选择题

（） I admit that there are problems, I don’t think that they cannot be solved.

A. Unless
B. Until
C. As
D. While