2. 外语
  3. Some of these studies have shown that although some people have trouble to fall asleep, others have an equally difficult time wa

Some of these studies have shown that although some people have trouble to fall asleep, others have an equally difficult time wa

admin2012-01-27  106
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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