单项选择题

Go on ______ the other exercise after you have finished this one.

A．to do
B．doing
C．with
D．to be doing
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单项选择题
I need one more stamp before my collection ______.
A．had completed
B．completes
C．has been completed
D．is completed
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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