题目内容：
19. In many countries now seat belts are _____ for the driver and front seat passengers at least.
(A) necessary
(B) in demand
(C) in need
(D) compulsory
参考答案：
选择题：19.In many countries now seat belts are _____ for
- 题目分类：郑州工程技术学院-大学英语（2）.
- 题目类型：选择题
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In many countries now seat belts are _____ for the driver and front seat passengers at least.
(A) necessary
(B) in demand
(C) in need
(D) compulsory