---May I borrow your book Steve Jobs ?
--- ________ you return it before Friday.
A．If onlyB．UnlessC．On condition that D．Now that
C

試題分析：考查連詞。A但愿；B除非；C條件是；D既然。句意：——我可以向你借《喬布斯》的書嗎？——條件是你在周五之前還。故C正確。
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