Question

【题目】He found it very difficult ______.

A. sleeping B. sleeps C. slept D. to fall asleep

Answer 1

【答案】D

【解析】句意：他发现很难入睡。本句使用句型sb. finds it+形容词+ to do sth., 动词不定式在句中作真正的宾语，it为形式宾语。difficult形容词，难的。A. sleeping现在分词，睡觉；B. sleeps动词三单，睡觉；C. slept过去式或过去分词，睡觉；D. to fall asleep动词不定式，入睡。故选：D。