C
FOR是现在完成时的标志,而A不能与FOR 连用,B后应该有ON
如果不明白,请再问；会议持续时间长,不能用begin这样的瞬间性动词,根据时态应该用完成时.如果对你有所帮助,
be on 是进行的意思,由于后面有for an hour 这个一段时间,所以前面要填一个延续性动词,并且是现在完成时.
英语选择题The meeting_____for an hour,but they haven't decided wh
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