问题
ne can answer the question _______ wecan complete the task in time, do you know— Yes, and this is because we don’t knowthe way _______ the scientist used last time．
A:whether; which
B:if; which
C:whether; in which
D:if; in which
B:if; which
C:whether; in which
D:if; in which
正确答案是：
同类题型
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