题目内容：
11. 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：11.In many countries now seat belts are _____ for
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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