单项选择题

We offered him our congratulations ______ his passing the college entrance exams.

A．at
B．of
C．for
D．on
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单项选择题
The students are ______ to hand in the exercises before class.
A．expected
B．hoped
C．agreed
D．promised
单项选择题
—How long has this bookshop been in business— ______ 1982.
A．After
B．In
C．From
D．Since
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