She found _____necessary to speak more English iShe found _____necessary to speak more English in chass.A.this B.that C.it D.what 为什么选it,别的选项为什么不可以

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She found _____necessary to speak more English i
She found _____necessary to speak more English in chass.A.this B.that C.it D.what 为什么选it,别的选项为什么不可以

it作形式主语