问题
选择题
--How do you pay the waitress? ---As a rule, they are paid ____.
A．by hour
B．by the hour
C．by an hour
D．by hours
答案
答案：B
表示“单位”的名词，前面要加定冠词。
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--How do you pay the waitress? ---As a rule, they are paid ____.
A．by hour
B．by the hour
C．by an hour
D．by hours
答案：B
表示“单位”的名词，前面要加定冠词。