—MayIgototheconcertwithyou?—I’mafraidnot

問題詳情：

— May I go to the concert with you?

— I’m afraid not ____ you have a ticket, because I have only one.

    A. since       B. if         C. unless        D. though

【回答】

C

知識點：連詞

題型：選擇題