【題目】We don't know ________will happen in 100 years.
A.what
B.when
C.why
D.where

【答案】A
【解析】句意：我們不知道100年后將會發(fā)生什么。know后是一個賓語從句，A .what什么；B. when 什么時候；C. why 為什么； D. where哪兒。此處缺少主語，只能是疑問代詞充當主語。所以答案是A。

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