react 动态路由:英语问题

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Has he bought that CD-ROM ?I don't know.
将两句合并成一句,

I don't know if he has bought that CD-ROM

I don't know if he has bought that CD-ROM.

I don't know whether he has bought that CD-ROM or not.

I don't know whether he has bought that CD-ROM .

I don't know whether he has bought that CD-ROM or not

英语问题 英语问题 英语~！问题 英语问题？ 英语问题？？ 英语问题： 英语问题 英语问题 英语问题 英语问题