We have learned English six years．A．since B．for C．on 题目和参考答案——青夏教育精英家教网——

题目内容

We have learned English ________ six years．
A．since B．for C．on

B

此题考查介词for和since在现在完成时中的区别，for后跟段时间，since后跟点时间，都表示段时间。

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