2. 外语
  3. After ______ on his couch more than a dozen times, he gave up his attempt to sleep.

After ______ on his couch more than a dozen times, he gave up his attempt to sleep.

admin2013-01-03  49
问题 After ______ on his couch more than a dozen times, he gave up his attempt to sleep.
选项 A、he overturned
B、his having turned over
C、turning over
D、turning up
答案C
解析 分词作状语时，前面可以加连词when，after，before，once等。
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