【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(huì)發(fā)生什么。know后是一個(gè)賓語(yǔ)從句，A .what什么；B. when 什么時(shí)候；C. why 為什么； D. where哪兒。此處缺少主語(yǔ)，只能是疑問(wèn)代詞充當(dāng)主語(yǔ)。所以答案是A。

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