专升本考试

试题来源：专升本英语-1
【单选题】 Since the road is wet this morning, ______ last night.
A．it must rain
B．it must be raining
C．it must have rained
D．it must have been rain

参考答案：C
网考网解析：
对过去发生的事作肯定的判断时，用must have ... 查看试题解析出处>>