Hearing mother’s step the children pretended .A. to sleepB. to be sleepingC. sleepingD. b

问题补充：

Hearing mother’s step, the children pretended .

A. to sleep

B. to be sleeping

C. sleeping

D. being sleeping

答案：

A. to sleep

B. to be sleeping

C. sleeping

(答案→)D. being sleeping

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