I am so tired，for I ________ English for 2 hours.A．is studying　B．have been study

题干

I am so tired，for I ________ English for 2 hours.

A．is studying	B．have been studying
C．was studying	D．had been studying

上一题下一题 0.64难度单项选择更新时间:2014-03-11 05:30:28

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