Your advice was a great help to us, without which all our efforts       .
A．wouldn’t pay offB．hadn’t paid off
C．wouldn’t have paid offD．didn’t pay off
C
考查虛擬語氣。根據(jù)前面的was和句意可知本題是一個由without引導(dǎo)的與過去事實相反含蓄條件句，使用情態(tài)動詞+have done的形式。句意：你的建議對我們很有益，要是沒有你的建議，我們的努力就不會得到回報。
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