问题描述：
____ your timely advice, I would never have known how to go about the work. A) Unless B) But for C)
____ your timely advice, I would never have known how to go about the work.
A) Unless B) But for C) Except for D) Not for
____ your timely advice, I would never have known how to go about the work.
A) Unless B) But for C) Except for D) Not for
问题解答：
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