2. 考研
  3. Some of these studies Ahave shown that although some people have trouble Bto fall asleep, others have Can equally difficult time

Some of these studies Ahave shown that although some people have trouble Bto fall asleep, others have Can equally difficult time

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问题 Some of these studies Ahave shown that although some people have trouble Bto fall asleep, others have Can equally difficult time Dwaking up.
选项
答案B错，应该改为“falling asleep”。
解析 一般情况下“have trouble+doing”是习惯用法，因此在本题中“to fall asleep”不对。应该把“to fall asleep”改为“falling asleep”。
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