During Level 2 epidemic alert, masks are _______ in public places; in other words, masks must be worn when outside.
Aimplausible
Bmandatory正確答案
Coppressive
Dcompetent
答案與詳解
mandatory 意為「強制的、必須的」,搭配後半句 must be worn(必須配戴),前後語意一致,為正解。
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