how do you study for a test?i study by making flashcard.为什麽用by?为什麽用doing?

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howdoyoustudyforatest?istudybymakingflashcard.为什麽用by?为什麽用doing?howdoyoustudyforatest?istudybymakingf

how do you study for a test?i study by making flashcard.为什麽用by?为什麽用doing?
how do you study for a test?i study by making flashcard.
为什麽用by?
为什麽用doing?

how do you study for a test?i study by making flashcard.为什麽用by?为什麽用doing?
by 后面接方式,表示“用...方式”
by是介词,介词后的动词都要用ing形式

by...doing...

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