The reason ____ the president kept silen

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问题 The reason ____ the president kept silent is still unknown.(  )A. why B. how C. what D. when

选项 A. why
B. how
C. what
D. when

答案 A

解析 句意:总统保持沉默的原因尚未揭晓。除先行词外定语从句是一个完整句子,由此可知先行词在定语从句中作状语,再加上定语从句的先行词为reason,所以引导词应用why。故选A。
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