题目内容
-How long has Sam been skating?
-He _________ for five hours.
[ ]
A.
have been skating
B.
has been skating
C.
was skating
D.
has been skated
答案:B
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题目内容
-How long has Sam been skating?
-He _________ for five hours.
have been skating
has been skating
was skating
has been skated