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问题: be the person怎么理解?

35.When your roommate turns to you for help,___
the person that is willing to go out of their
way.
A.be B.to be C.being D.is
答案给的A,为什么不选C?be the person在逗号后考什么语法?

解答:

be the person 是祈使句.

前面的是when引导的时间状语, 后面的that引导定语从句,修饰person.