用适当形式填空并解释意思The book is very ______(use) to us.

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用适当形式填空并解释意思The book is very ______(use) to us.
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用适当形式填空并解释意思The book is very ______(use) to us.
用适当形式填空并解释意思
The book is very ______(use) to us.

用适当形式填空并解释意思The book is very ______(use) to us.
useful