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
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单项选择题
We all know that, ______ the situation will get worse.
A．not if dealt carefully with
B．if not carefully dealt with
C．if dealt not carefully with
D．not if carefully dealt with
单项选择题
We can't understand why he avoided ______ to us.
A．to speak
B．speak
C．having spoke
D．speaking
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