----the question made her teacher angey and upset.答案Mary is refusing to answer 为什么不能去掉is

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----the question made her teacher angey and upset.答案Mary is refusing to answer 为什么不能去掉is
----the question made her teacher angey and upset.答案Mary is refusing to answer 为什么不能去掉is

----the question made her teacher angey and upset.答案Mary is refusing to answer 为什么不能去掉is
如果去掉is就不能成为一个完整的句子了.因为这是一个句子做主语.

正在进行时语态,Be动词+ing