问题描述：
The two brothers ____ on the phone for 40 minutes.I wonder when they can put down the phone.
A.were chatting B.chatted C.have been chatting D.have chatted
我认为选d,c也可以为何答案选b
A.were chatting B.chatted C.have been chatting D.have chatted
我认为选d,c也可以为何答案选b
问题解答：
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