I am doing a survey about how ___(improve) english quickly.

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Iamdoingasurveyabouthow___(improve)englishquickly.Iamdoingasurveyabouthow___(improve)englishquickly.

I am doing a survey about how ___(improve) english quickly.
I am doing a survey about how ___(improve) english quickly.

I am doing a survey about how ___(improve) english quickly.
to improve 介词后用非谓语动词做宾语