i study for a test ____working with my classmates.a.by b.in c.to d.with

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i study for a test ____working with my classmates.a.by b.in c.to d.with

i study for a test ____working with my classmates.a.by b.in c.to d.with
i study for a test ____working with my classmates.a.by b.in c.to d.with

i study for a test ____working with my classmates.a.by b.in c.to d.with
by

a

by

a by,我和同学一起搞了一项试验。

i study for a test ____working with my classmates.a.by b.in c. to d.with
选择a.我通过和同学一起学习来准备考试。by+动词的ing形式表示手段和方法。

I study for a test ( by )working with my classmates.