问题补充:
He has been working hard day and night, which, of course,his tiredness.
A. answers for
B. accounts for
C. applies for
D. stands for
答案:
A. answers for
(答案→)B. accounts for
C. applies for
D. stands for
解析:考查短语辨析。answers for回答,accounts for做出解释,applies for申请,stands for代表,句意:他一直日日夜夜的工作,当热这就能解释他劳累的原因了。故选B。