They have been skating __________. A．for three hours B．since three hours ago C．three ho
Theyhavebeenskating__________.A．forthreehoursB．sincethreehoursagoC．threehoursagoD．sin...
They have been skating __________. A．for three hours B．since three hours ago C．three hours ago D．since three hours
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| A |
| for 一段时间，为现在完成时态的时间标志，故选答案为A |
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