问题
选择题
It ______ heavily when he got back home for he was wet all over．
A．was raining
B．must have been raining
C．must be raining
D．rained
答案
答案：B
本题考查时态。when 从句表示正在发生的动作。must have been raining表示过去一直在延续的动作，符合题意。选B。
