单项选择题


A.Since
B.For
C.At
D.In
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单项选择题
A.centralB.concentratingC.focusingD.centering
A.central
B.concentrating
C.focusing
D.centering
单项选择题
The victims of the bombing are ______.
A.college students
B.reporters
C.embassy officials
D.local residents
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