《Unit 2 My mother's cleaning our house and sweeping away bad luck.》例题解析

1单选题

Look out! Look at the traffic lights _____ crossing the road.

A

before

B

after

C

since

D

题目答案

A

答案解析

根据本题语境可知，在过马路之前要看交通信号灯，故所缺的词是 before“在……之前”。