Although they argued for two hours ________, no decision was reached．

Although they argued for two hours ________, no decision was reached．

A.at the end

B.on end

C.in the end

D.no end

答案及解析： B

解析：

on end意为“连续”。at the end“在终点/末尾”，in the end“最后”，no end“非常”。