问题
选择题
(2013·江西重点中学高三一模)As ________ rule, parttime workers such as babysitters or English tutors are paid by ________ hour.
A．the; an
B．a; an
C．a; the
D．the; /
答案
答案：C
选C 考查冠词。第一个空泛指“某一个规则”，用不定冠词a；by the hour是固定用法，表示“按小时”。