( )We had to stop working outside------- the heavy rain yest

C
A instead of 代替
B as for 关于,至于
C because of 因为,由于
D as if 犹如,好像
原句翻译是：昨天下午 ,由于大雨,我们不得不停止室外工作.
Outside是地点状语,)We had to stop working outside：我们必须停止室外工作.
because of the heavy rain是原因状语
yesterday afternoon：是时间状语
所以选C :因为,由于