Don’t sing now. The baby in the room.A. sleepsB. sleepingC. is sleepingD. are sleeping

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。