题目内容
19.Teenagers have to be 18 years old before they to drive a car.( )| A. | are allowed | B. | will be allowed | C. | allow |
分析 青少年在允许开车之前必须满十八岁.
解答 答案:A.表达的是客观事实用一般现在时,主语they是allow的承受者,allow sb to do sth,故用被动语态sb be allowed to do sth,故答案是A.
点评 allow doing sth.允许做某事
allow sb to do sth.允许某人做某事
(注意被动:sb be allowed to do sth.)
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