单选题
If it ______ for the snow, we ______ the mountain the day before yesterday.
A、
were not; could have climbed
B、
were not; could climb
C、
had not been; could have climbed
D、
had not been; could climb
【正确答案】
C
【答案解析】
要不是下雪，我们前天应该去爬山了。此句为虚拟语气，从句用过去完成时，主句用could+现在完成时，表示“与过去事实相反的情况”。
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