问题补充:
Many air flights because of the eruption of the volcano, in case, many passengers had no choice but to take a train.
A. had been cancelled; which
B. have been cancelled; what
C. had been canceling; that
D. have been canceling; where
答案:
(答案→)A. had been cancelled; which
B. have been cancelled; what
C. had been canceling; that
D. have been canceling; where
解析:考查时态及定语从句。句意:由于火山的爆发,许多航班都被取消了,在这种情况先,许多乘客只有坐火车了。根据语境可知主句描述的是过去某个时间前已经完成的动作,故用过去完成时态。在非限定性定语从句中,指代前文整句话内容时,只能用which做引导词,故选A。