题目内容
— No one can answer the question _______ we can complete the task in time, do you know?
— Yes, and this is because we don’t know the way _______ the scientist used last time．
|
A．whether; which |
B．if; which |
|
C．whether; in which |
D．if; in which |
【答案】
A
【解析】略
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