You have to be 18 years before you to drive a car.A. are allowedB. areC. allowedD. allow

问题补充：

You have to be 18 years before you to drive a car.

A. are allowed

B. are

C. allowed

D. allow

答案：

(答案→)A. are allowed

B. are

C. allowed

D. allow

解析：允许某人做某事allow sb to do sth,本题中you是被允许所以选用被动语态选项A正确。 直到18岁才允许你开汽车。