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people are puzzled _ they read the book A the first time B f

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people are puzzled _ they read the book A the first time B for the first time 为什么选A.请说明理由
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.
举个两个例句:
This is the first time that I have been to America
I saw the sea for the first time in my life .