Some of you may have finished unit one._
题型:选择题
问题:
Some of you may have finished unit one._____; you can go on to unit two.
A.If you may
B.If you do
C.If not
D.If so
Some of you may have finished unit one._____; you can go on to unit two.
A.If you may
B.If you do
C.If not
D.If so