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

My brother ______ while he ______ his bicycle and hurt himself.

A．fell, was riding
B．fell, were riding
C．had fallen, rode
D．had fallen, was riding

单项选择题

My dictionary ______ , I have looked for it everywhere but still ______ it.

A．has lost, don't find
B．is missing, don't find
C．has lost, haven't found
D．is missing, haven't found

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