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It would seem to be a general truth__________ nothing is as straightforward as it at first seems.
A.thatB.whenC.whatD.if
A

试题分析:句意:没有什么起初似乎是简单易懂,这似乎是一个一般的真理。It是形式主语,nothing is as straightforward as it at first seems是真正的主语从句,其中nothing是主语,as straightforward as it at first seems是表语。这个主语从句主语,表语齐全,故用that。that只引导名词性从句,不做句子的成分。When表示时间,在句中作状语。what 充当名词性从句的主语,宾语和表语。If 表示是否。故选A。
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