问题
选择题
The boy was so tired that he fell asleep ________ his mother could take off his clothes.[ ]
A. before
B. after
C. while
D. when
答案
答案：A
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The boy was so tired that he fell asleep ________ his mother could take off his clothes.[ ]
A. before
B. after
C. while
D. when
答案：A