--- No one can answer the question ______ we can plete 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; whichC.whether; in whichD.if; in which
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A解析第一空考查同位语从句，说明the question的内容，用whether引导，不能用if，第二空是定语从句，the way做先行词，但定语从句中缺少宾语，用which引导定语从句。选A。