Last year the number of students who graduated with a driving license reached 200,000, a(n) _______ of 40,000 per year.
A．a(chǎn)verageB．numberC．a(chǎn)mountD．quantity
A
短語(yǔ)辨析。An average of 平均；句意：去年取得駕照的畢業(yè)生的數(shù)量達(dá)到了20萬(wàn)，平均每年4萬(wàn)。
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