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【简答题】
已知三点A（1，-1），B（4，2m），C（2m，0）共线，求m的值．
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【单选题】－Why didn’t you go to the cinema with us this afternoon, Jim? －Because I ______ at the station for my uncle from Beijing at that time.
A.
was waiting
B.
have waited
C.
am waiting
D.
will wait
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