I have been skating nine o’clock. 题目和参考答案——青夏教育精英家教网——

题目内容

I have been skating _______ nine o’clock.

B

考查现在完成时。Since和for都可和现在完成时连用。但是，since后加时间点，而for后加时间段，9点是时间点，故用since。句意“我从9点开始，就一直在滑冰了。”故选B。

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