单项选择题

Only __________ in this waywork out this math problem．

A．we can
B．can we
C．can
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单项选择题
When I got to the cinema, the filmfor half an hour．
A．started
B．have started
C．had been on
单项选择题
I______my English book in the reading-room．Please go and get it for me．
A．forgot
B．lost
C．left
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