Some of these studies (have shown) that although some people have trouble (to fa

游客2025-05-05 72

问题 Some of these studies (have shown) that although some people have trouble (to fall asleep), others have an (equally) difficult time (waking up).

选项 A、have shown
B、to fall asleep
C、equally
D、waking up

答案 B应改为falling asleep。

解析 have trouble doing sth.

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