— Why didn’t you arrive there until three days later?
— Because the heavy rain _____ the difficulties of the journey.A.addedB.added toC.was addedD.was added to
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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。