易混介词专练 since, for 1. I have learned English 1990. 2. I have learned English over 10 years. 题目和参考答案——青夏教育精英家教网——

题目内容

易混介词专练

since, for

1. I have learned English ________ 1990.

2. I have learned English ________ over 10 years.

答案：since,for
解析：

1. since, 后边跟时间点。

2. for, 接时间段。

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