问题
选择题
The reason _____ he failed the exam was that he spent more time playing and less time learning. [ ]
A. because
B. that
C. why
D. which
答案
答案：C
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The reason _____ he failed the exam was that he spent more time playing and less time learning. [ ]
A. because
B. that
C. why
D. which
答案：C