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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
admin
2005-06-26
143
问题
Some of these studies A
have shown
that although some people have trouble B
to fall asleep
, others have C
an equally
difficult time D
waking 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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