【题目】The manager came over and asked the customer how____
A. did the quarrel came about
B.the quarrel had come about
C. had the quarrel come about
D. had the quarrel come about
在线课程【答案】B
【解析】
试题分析：考查宾语从句。句意：经理走过来，问客户争吵是如何发生的。 因为后面是宾语从句，要用正常语顺，不能再用助动词，did 、had等了。故选B。