问题
_____ twice a year, whether it is a car or a bus, is a rule that every driver must obey in this city.
A:Examining
B:Examined
C:To examine
D:Being examined
B:Examined
C:To examine
D:Being examined
正确答案是：
同类题型
How long do you guess it will be ________ we graduate from senior high school
Swimming in the pool with the children ________ veryinteresting.
The boy was so tired that he fell asleep _____________ his mother could take off his clothes．
Let’s do something for our dad.— Good idea. We should always _________ father’s love for us.