9．They are in different（不同的）______，but they are in the same_______．（　　）
A．class；schoolB．classes；schoolsC．class；schoolsD．classes；school

分析 他們?cè)诓煌陌嗉?jí)，但是在同一所學(xué)校．

解答 答案：D，考察名詞單復(fù)數(shù)辨析，后句中提到他們?cè)谕凰鶎W(xué)校，所以是一所學(xué)校，用單數(shù)，排除BC兩個(gè)選項(xiàng)；因?yàn)槭窃诓煌陌嗉?jí)，所以他們所在的至少為兩個(gè)班，所以應(yīng)該用復(fù)數(shù)形式，由此確定答案為D．

點(diǎn)評(píng) 考察名詞單復(fù)數(shù)形式的變化，應(yīng)根據(jù)具體的名詞類型加以分析后選擇

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