问题补充:
Don’t sing now. The baby in the room.
A. sleeps
B. sleeping
C. is sleeping
D. are sleeping
答案:
A. sleeps
B. sleeping
(答案→)C. is sleeping
D. are sleeping
解析:考查时态。根据前一句中的时间状语 now,可知本句的时态为现在进行时,其主语为单数The baby,故选C。
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