Sugar is sold by _______ pound, petrol by _______ gallon.
A. a; a B. a; the
C. the; a D. the; the
Sugar is sold by _______ pound, petrol by _______ gallon.
A. a; a B. a; the
C. the; a D. the; the
D
“糖按磅售，汽油按加仑售。” 计量单位名词前的the 或a都可以表示“每一”，有时可以互换；但在介词by后只能用定冠词。