_____the beginning of the 19th century did scientists know that all matter is made up of atoms.

A,At     B,By     C,Up to     D,Not until

 

【答案】

D

【解析】

試題分析:句子用了部分倒裝,所以前面用Not until

考點(diǎn):倒裝的考查

點(diǎn)評(píng):句首狀語(yǔ)為否定詞或半否定詞的句子。這類(lèi)詞或短語(yǔ)主要有never, neither, nor, little, seldom(很少,不常), rarely(很少,罕有), hardly, scarcely(幾乎不,簡(jiǎn)直沒(méi)有), no sooner(立即), not only, in no way(決不), at no time, few, not, no等, 用部分倒裝。部分倒裝是把be動(dòng)詞、情態(tài)動(dòng)詞、助動(dòng)詞放到主語(yǔ)之前。如果句子中沒(méi)有這些詞,要在主語(yǔ)之前加助動(dòng)詞do / does / did等,而把原來(lái)的謂語(yǔ)動(dòng)詞變成原形放在主語(yǔ)之后。

 

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