题目内容
—Can you watch TV _____ school nights?
—Yes, but I have to be _____ bed _____ ten o'clock.
—Yes, but I have to be _____ bed _____ ten o'clock.
[ ]
A. in; on; by
B. on; on; in
C. on, in; by
D. in; in; at
B. on; on; in
C. on, in; by
D. in; in; at
C
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