填空题

Some of these studies have shown that although some people have trouble to fall asleep, others have an equally difficult time waking up.
A. have shown
B. to fall asleep
C. equally
D. waking up

【参考答案】

B应改为falling asleep。

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Some of these studies have shown that although some people have trouble to fall asleep, others have an equally difficult time waking up.A. have shownB. to fall asleepC. equallyD. waking up