问题
选择题
| —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
答案：B
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| —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