语法与词汇 ______ five minutes earlier, you would not have missed the last train for Shanghai, but you were late.

【正确答案】 A

【答案解析】虚拟语气had/should/were提前的情况。从主句would not have missed的形式，看出是对过去的虚拟，因此要把had提前。要是你早来五分钟，你就不会错过最后一班去上海的火车了，但是你已经晚了。