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We have English classes every day but yesterday we_____.A.we

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We have English classes every day but yesterday we_____.A.weren't B.didn't C.wasn't D.don't
选B,因为have English classes 中的have是实意动词,表示上课的意思,变否定句和疑问句式都要用到助动词.而后面的转折句中出现了yesterday,时态已经确定用过去时,根据句意所以助动词应选用didn't