The students are to hand in the exercises before class.A. wishedB. hopedC. enjoyedD. prom

问题补充：

The students are to hand in the exercises before class.

A. wished

B. hoped

C. enjoyed

D. promised

答案：

(答案→)A. wished

B. hoped

C. enjoyed

D. promised

解析：把句子还原成主动语态,便可以看出是不定式的复合结构,而只有A可以这样用.

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