A1l flights _________ because of the heavy storm, so we decided to take the train.
A．have canceledB．have been canceled
C．had canceledD．had been canceled
D

試題分析：考查時(shí)態(tài)語態(tài)：句意：由于暴風(fēng)雨所有的航班都已經(jīng)被取消了，所以我們決定乘坐火車。因?yàn)楹桨嗍潜蝗∠帽粍?dòng)語態(tài)，排除AC，從so we decided to take the train.可知是在決定之前，航班就取消了，是過去的過去，用過去完成時(shí)，選D。
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