题目内容

I am so tired，for I ________ English for 2 hours.
A．is studying　B．have been studying
C．was studying　D．had been studying
B
句意：我好累，因为我已经学习英语两个小时了。根据“for 2 hours”可知，此处表示动作从过去某一时间开始，一直延续到现在，可能还要继续下去，故应用现在完成进行时。
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