our teacher has studied japanese-----there years,since和for填哪个?

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our teacher has studied japanese-----there years,since和for填哪个?

our teacher has studied japanese-----there years,since和for填哪个?
our teacher has studied japanese-----there years,since和for填哪个?

our teacher has studied japanese-----there years,since和for填哪个?
填for.
since后面接时间点.for后面接时间段.

For three years ,for 加段时间