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

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

出自：南阳师范学院-教育学-大学英语（四）

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