【題目】I have been skating _______ nine o’clock.

A. for B. since C. at D. From

【答案】B

【解析】

試題分析：句意：自從九點(diǎn)我一直在滑冰。根據(jù)句意及題干分析此句是現(xiàn)在完成進(jìn)行時(shí)態(tài)，所以和時(shí)間點(diǎn)nine o’clock連用要用since，故選B。

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