阿摩線上測驗
7 Wearing a helmet is ________ when riding a motorcycle in this country, so if you don’t, you can be fined by the police.
(A) optional
(B) voluntary
(C) compulsory
(D) despensable
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統計： A(0), B(0), C(15), D(2), E(0) #4027478
統計： A(0), B(0), C(15), D(2), E(0) #4027478
