---Why do you e back so late?
---Because there were too many people in the supermarket, and I had to to pay for the things.
A. wait in line
B. cut in line
C. stand up
D. speak loudly
网友回答
(答案→)A. wait in line
B. cut in line
C. stand up
D. speak loudly
解析：考查固定短语。句意：----你为什么来的如此晚？----因为超市里有太多人，我不得不排队等候来付钱。故选A。