We have learnt English____three years.是since还是佛如?

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We have learnt English____three years.是since还是佛如?
We have learnt English____three years.是since还是佛如?

We have learnt English____three years.是since还是佛如?
for
for 表一段时间
since 是自从 since three years ago 就对了
希望对你有所帮助,有不会的可以再问,

for since+时间点 for+时间段