People were puzzled they read the book.A. the first time B. at the first timeC. for the first time D

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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】

试题分析：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。