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; whichB．have been cancelled; what
C．had been canceling; thatD．have been canceling; where
A
考查時態(tài)及定語從句。句意：由于火山的爆發(fā)，許多航班都被取消了，在這種情況先，許多乘客只有坐火車了。根據(jù)語境可知主句描述的是過去某個時間前已經(jīng)完成的動作，故用過去完成時態(tài)。在非限定性定語從句中，指代前文整句話內(nèi)容時，只能用which做引導詞，故選A。
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