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英语
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There---a blackboard in our classroom before.A.weren't B.wasn't c.aren't 选择正确答案
人气:392 ℃ 时间:2019-11-23 02:44:44
解答
a blackboard是单数,要用is/was
而后面的before决定了要用过去式
而这里的选项都是否定,就不要考虑是肯定还是否定了
因此要选B
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