— Why didn’t you arrive there until thre...

— Why didn’t you arrive there until three days later?

— Because the heavy rain _____ the difficulties of the journey.

A．added

B．added to

C．was added

D．was added to

B 【解析】考察add的用法.add to意思是加入、加到、增加的意思。根据题意，大雨加大了行程的困难。大雨是动作的施动者，用主动语态，根据问句可知问的是过去发生的事情，故用过去时态，选B。

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