问题
选择题
Your advice was a great help to us, without which all our efforts .
A．wouldn’t pay off
B．hadn’t paid off
C．wouldn’t have paid off
D．didn’t pay off
答案
答案：C
考查虚拟语气。根据前面的was和句意可知本题是一个由without引导的与过去事实相反含蓄条件句，使用情态动词+have done的形式。句意：你的建议对我们很有益，要是没有你的建议，我们的努力就不会得到回报。