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it have been the failure to pick up directions from the ground control that caus

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it have been the failure to pick up directions from the ground control that caus

______ it have been the failure to pick up directions from the ground control that caused the air crash?

A. Must   B. Could C. Would       D. Should

试题答案

D

解析:

略

标签：picktoupfromdirections

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