Sally has been swimming ______ four hours. A.for aboutB.sinceC.aboutD./
题型:不详难度:来源:
Sally has been swimming ______ four hours. A.for about | B.since | C.about | D./ |
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答案
A |
解析
本题的含义是她游泳已经游了四个小时,表示做事时间长度,用于完成时,通常用介词for连接时间长度,故选A. |
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