用所给词适当形式填空They find listening to the tape is ______(use) learn English.

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用所给词适当形式填空They find listening to the tape is ______(use) learn English.

用所给词适当形式填空They find listening to the tape is ______(use) learn English.
用所给词适当形式填空
They find listening to the tape is ______(use) learn English.

用所给词适当形式填空They find listening to the tape is ______(use) learn English.
useful to

你确定提示完整的吗?

used to

应该是useful,你是不是少了一个to