they had to change the planes ,() they A hadn't B didn't C did
人气：319 ℃ 时间：2020-10-01 08:46:21
解答
B,在这里,had是过去时,所以应该用助动词did,前面是肯定,后面应该用否定.确定吗回答嗯，我觉得是的
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