问题
选择题
— 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
答案：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。