There is no point advocating banning smoking in public ________ the law is introduced.
A．whenB．unless
C．sinceD．because
B
B 考察連詞。句義：除非成為法律條文，否則在公共場所倡議禁止吸煙是沒有意義的。When當..時；unless除非；since自從；because因為；故B正確。
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