题目内容
用所给动词的适当形式填空。
How long _____ the students ______ (learn) English? They _____(learn) it since they ______ (be) nine years old.
答案:have,learned,have learned,were
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题目内容
用所给动词的适当形式填空。
How long _____ the students ______ (learn) English? They _____(learn) it since they ______ (be) nine years old.