单项选择题

As a rule, the workers are paid（）

A．at the hour
B．by the hour
C．for an hour
D．in an hour

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单项选择题

We should（）study hard during our time in the university.

A．all
B．every
C．some
D．any

单项选择题

It was not until（）that（）to prepare his lessons.

A．did his father come in, the boy began
B．did his father come in, did the boy begin
C．his father came in, the boy began
D．his father came in, did the boy begin