问题
选择题
The road is under construction and that is _____ he hasn't arrived. [ ]
A. the reason at which
B. why
C. the reason which
D. what
答案
答案：B
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The road is under construction and that is _____ he hasn't arrived. [ ]
A. the reason at which
B. why
C. the reason which
D. what
答案：B