题目内容：

a number of people什么(quarrel )upstairs
he doesnt know 什么to hand in the home work
a,where
b,what
c,which
d,when

Some people___ (quarrel) upstairs last night so I couldn’t sleep at all

优质解答

are quarrelling很多人在楼上吵he doesnt know【when】to hand in the homework答案D 意为：他不知道什么时候交作业Some people_were quarrelling__ (quarrel) upstairs last night so I couldn’t sleep at all...