Bill keeps _____(ask) his teacher many questions.用所给的词适当形式填空.

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Bill keeps _____(ask) his teacher many questions.用所给的词适当形式填空.

Bill keeps _____(ask) his teacher many questions.用所给的词适当形式填空.
Bill keeps _____(ask) his teacher many questions.
用所给的词适当形式填空.

Bill keeps _____(ask) his teacher many questions.用所给的词适当形式填空.
asking
Bill持续问老师很多问题
keep doing sth,
而且时态是:从过去一直持续到现在

asking
keep doing sth

asking