________ of the city was covered with the heavy smog.
A．Two-thirdB．Two-thirds
C．Two-three D．Two-threes
B

試題分析：句意:這個(gè)城市的三分之二覆蓋著重度霧霾。分?jǐn)?shù)表達(dá)法:分子用基數(shù)詞，分母用序數(shù)詞，分子大于一分母用復(fù)數(shù).two-thirds三分之二。故選B。
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