单选题 In order to obtain the needed information, you should write simply, clearly, and concisely ________the reader wants to know.
【正确答案】 A
【答案解析】固定搭配。空格处的词既做主句的宾语,又做从句的主语,因而应选先行词和关系代词的结合体的“what”,表示“……的东西”。