The vegetables didn’t taste very good.They＿＿＿＿too long. A. had been cookedB. were cooked C

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(答案→)A. had been cooked
B. were cooked
C. had cooked
D. cooked
解析：cook发生在didn’ t taste very good 之前，且与主语之间有被动关系，故用过去完成时的被动语态。