单项选择题

21（）

A．at
B．from
C．in
D．for

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单项选择题
My brother ______ down 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
The university has ______ a special class to help poor readers.
A．found
B．set up
C．build
D．finded
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