— 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; whichB．if; which
C．whether; in whichD．if; in which
A
第一空考查同位語從句，說明the question的內(nèi)容，用whether引導(dǎo)，不能用if，第二空是定語從句，the way做先行詞，但定語從句中缺少賓語，用which引導(dǎo)定語從句。選A。
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