Question

_____the beginning of the 19^th century did scientists know that all matter is made up of atoms.
A,At     B,By     C,Up to     D,Not until

Answer 1

D

試題分析：句子用了部分倒裝，所以前面用Not until
點(diǎn)評(píng)：句首狀語為否定詞或半否定詞的句子。這類詞或短語主要有never, neither, nor, little, seldom(很少，不常）, rarely（很少，罕有）, hardly, scarcely（幾乎不，簡直沒有）, 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)詞放到主語之前。如果句子中沒有這些詞,要在主語之前加助動(dòng)詞do / does / did等,而把原來的謂語動(dòng)詞變成原形放在主語之后。