It ______ for a week and the streets were flooded.

It ______ for a week and the streets were flooded.
A、has rained
B、was rained
C、had been raining
D、should have rained
【正确答案】：C
【题目解析】：根据and后面的were可知，前半句的时态也应为过去的某种时态，因此可排除选项A；下雨应为主动，而非被动，因此可排除选项B；should have done意为”本应该干某事“，与题意不符。