题目内容
介词、副词填空
The professor talked ______ two hours ______ stopping ______ a time.
答案：
解析：
解析：
for; before; at。at a time一次,每次
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题目内容
介词、副词填空
The professor talked ______ two hours ______ stopping ______ a time.
for; before; at。at a time一次,每次
|