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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