--Would you like to go bike riding with us tomorrow?  ---Sure, ____ I am busy.
A．sinceB．unlessC．whenD．until
B
連詞辨析。since 自從……以來；unless除非；when 當……時；until直到……。句意：明天你愿意和我們一起騎自行車兜風去嗎?——當然了，除非我忙。故選B。
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