What do you think of the reason ________ he explained in his last letter ________ refusing the job?A.why; whyB.that; for whichC.which; forD.that; because
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C解析本题考查点一是reason用作先行词时引导定语从句的关系代/副词；考查点二是reason与介词for搭配，表达“……的原因”。分析reason之后的定语从句可以看出动词explained后缺少宾语，因此第一空格处应填入关系代词that或which或省略。