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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

試題分析：句意：沒有什么起初似乎是簡單易懂，這似乎是一個一般的真理。It是形式主語，nothing is as straightforward as it at first seems是真正的主語從句，其中nothing是主語，as straightforward as it at first seems是表語。這個主語從句主語，表語齊全，故用that。that只引導名詞性從句，不做句子的成分。When表示時間，在句中作狀語。what 充當名詞性從句的主語，賓語和表語。If 表示是否。故選A。
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