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单项选择题
A.What's the matter
B.What's going on
C.What did you do
D.What have you done
单项选择题
A.Before
B.At
C.In
D.Between
单项选择题
A.At the first
B.At present
C.At the present
D.At first
单项选择题
A.A little
B.Little
C.A few
D.Few