Sugar is sold by _______ pound, petrol by _______ gallon.?
A．a; aB．a; the?
C．the; aD．the; the?
D?
“糖按磅售，汽油按加侖售�！� 計量單位名詞前的the 或a都可以表示“每一”，有時可以互換；但在介詞by后只能用定冠詞。
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