I didn't know ( ) A.what matter was; B.what was matter 此题选哪项

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I didn't know ( ) A.what matter was; B.what was matter 此题选哪项
I didn't know ( ) A.what matter was; B.what was matter 此题选哪项

I didn't know ( ) A.what matter was; B.what was matter 此题选哪项
B 注意：这句话的主语是WHAT,故不用调换位置

A 陈述句语序