Question

— 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

Answer 1

A

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。