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sally has been swimming _____four hours 1.for about 2.since 3.about 4.in
人气:397 ℃ 时间:2020-03-30 04:27:20
解答
A
for +一段时间,与现在完成时连用
注:SINCE +过去的时间点,也是与完成时连用,如 since four hours ago
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