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Plastic bags have caused serious environmental pollrtion,____ A haven't they B have they
C don't they
D do they
人气：224 ℃ 时间：2020-04-07 01:24:39
解答
选择A
这里考察的是反义疑问句
因为前面是have caused这个完成时,而且是肯定,所以后面部分应该是否定的,而且是havn't they,选择A
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