语法与词汇 4.My parents______at the airport because of the storm. Otherwise, they would have been here by lunch time.
【正确答案】 C
【答案解析】根据后半句otherwise引导的含蓄条件句可知,前句应该描述的是过去发生的事情,且此处只是简单的描述过去发生的动作,故选C。