If it for the heavy rain then we would have arrived here ahead of time.A. shouldn’t beB.

问题补充：

If it for the heavy rain then, we would have arrived here ahead of time.

A. shouldn’t be

B. weren’t

C. had not been

D. be not

答案：

A. shouldn’t be

B. weren’t

(答案→)C. had not been

D. be not

解析：考察虚拟语气，根据题意，如果那时不下这么大的雨，我们会提前到达这里。可知从句假设的内容应该在过去已经发生，故从句用过去完成时态，选C。在表示过去的虚拟语气结构为从句had +动词过去分词 主句would / should / might / could have + 动词过去分词。