问题
选择题
Jack has been skating four hours ago .
A since B. about C.for about D. in
答案
答案：A
在完成时中常用for和since引导时间状语。Since+点时间，for+段时间。
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Jack has been skating four hours ago .
A since B. about C.for about D. in
答案：A
在完成时中常用for和since引导时间状语。Since+点时间，for+段时间。