单项选择题

A．They are twins.
B．They are classmates.
C．They are friends.
D．They are colleagues.
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单项选择题
A．moreB．thingC．elseD．none
A．more
B．thing
C．else
D．none
单项选择题
A．recitingB．to reciteC．to be recitingD．to have recited
A．reciting
B．to recite
C．to be reciting
D．to have recited
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