Question

【题目】Teenagers have to be 18 years old before they ______ to drive a car.

A. are allowed B. will be allowed C. allowed D. allow

Answer 1

【答案】A

【解析】句意：青少年在被允许开车前必须年满18岁。allow动词，允许；be+动词的过去分词，表示被动含义。本句陈述的是事实，所以使用一般现在时态的被动语态：are/is/am+动词过去分词。故选:A。