He may come here if he ______ (be) free tomorrow.

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He may come here if he ______ (be) free tomorrow.

He may come here if he ______ (be) free tomorrow.
He may come here if he ______ (be) free tomorrow.

He may come here if he ______ (be) free tomorrow.
这考的是虚拟语气,前面有may,虽有if后的系动词要用原型,答案是 is