问题
选择题
The accident happened at nine o'clock in the morning ____ we were all busy with our work. [ ]
A. that
B. which
C. when
D. as
答案
答案：C
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The accident happened at nine o'clock in the morning ____ we were all busy with our work. [ ]
A. that
B. which
C. when
D. as
答案：C