问题
选择题
He has to be _____ bed _____ nine o'clock.[ ]
A. at; at
B. to; by
C. in; by
D. by; at
答案
答案：C
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He has to be _____ bed _____ nine o'clock.[ ]
A. at; at
B. to; by
C. in; by
D. by; at
答案：C