The reason he was late was he hardly knew the way to the meeting place.
A. what; because
B. for which; that
C. that; because of
D. why; because of
网友回答
A. what; because
(答案→)B. for which; that
C. that; because of
D. why; because of
解析：考查定语从句及名词性从句。第一空考查定语从句，先行词为the reason，在从句中作原因状语，故用关系词why或for which；第二空考查表语从句，在从句中不作成分，选B。