We （have been） good friends since we met at school.为什么用have been?
还有Why not (go) to the cinema with me?为什么用go?
人气：241 ℃ 时间：2019-08-30 13:57:23
解答
1.since we met at school ----since .一般和【现在完成时】连用.动词形式是 have/has+ 过去分词
2.Why not + 动词原形 表建议,是个固定句型
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