The boy pretended when the teacher came in.A. sleepingB. asleepC. sleepyD. to be asleep

问题补充：

The boy pretended when the teacher came in.

A. sleeping

B. asleep

C. sleepy

D. to be asleep

答案：

A. sleeping

B. asleep

C. sleepy

(答案→)D. to be asleep

解析：sleepi动词，睡觉；asleep形容词，睡着的，长眠的；sleepy，欲睡的，困乏的。句意：当老师进来时，这个男孩假装在睡觉。不定式作宾语表示具体的将要进行的动作，故选D。