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题目内容
（河北工程技术学院大学英语1）
25、(单选、2.5分)
These apple trees,___________I planted three years ago, have not borne any fruit.
A、that
B、what
C、which
D、when
These apple trees,___________I planted three years ago, have not borne any fruit.
A、that
B、what
C、which
D、when
参考答案