i found ____ difficult to remember so many ENglish words in such a short time.A one B it C them D that

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i found ____ difficult to remember so many ENglish words in such a short time.A one B it C them D that
i found ____ difficult to remember so many ENglish words in such a short time.
A one B it C them D that

i found ____ difficult to remember so many ENglish words in such a short time.A one B it C them D that
B.it 用来代替不定式做形式宾语.