People were puzzled they read the book.A.the first timeB.at the first timeC.for the first timeD.at f

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【题目】People were puzzled _______ they read the book.
A.the first time
B.at the first time
C.for the first time
D.at first

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【答案】A
【解析】考查时间状语从句。the first time 第一次，名词词组用作连词，可引导句子；for the first time 第一次，使用时作时间状语，类似副词性，不可引导句子。故选A。