Nowadays            of business letters are written in English.？ 
A．two-thirdB．two-thirdsC．two-threeD．two-threes
B
考查分?jǐn)?shù)。分子用基數(shù)詞分母用序數(shù)詞表示，當(dāng)分子大于一，分母要加S。故選B。
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