These apple trees, ______I planted three years ago, have not borne any fruit.

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问题 These apple trees, ______I planted three years ago, have not borne any fruit.

选项 A、which
B、that
C、when
D、what

答案A

解析分析句子结构可知，两个逗号之间为非限制性定语从句，指代先行词These apple trees。而从句成分不完整，缺少planted的宾语，所以应用关系代词which来引导从句。that只能引导限制性定语从句；when引导定语从句时，先行词只能为时间；what不能引导定语从句，都不符合题意。故选A。

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