Many air flights because of the eruption of the volcano, in case, many passenger

Many air flights_________because of the eruption of the volcano, in _______case, manypassengers had no choice but to take a train.

  A. had beencancelled; which                                              B.have been cancelled; what

C. had been canceling; that                                                      D.have been canceling; where

试题答案

【答案】

A

【解析】略