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单项选择题
A.write
B.have written
C.was writing
D.have been writing
单项选择题
A.need
B.should
C.oughtto
D.have to
单项选择题
A.Should
B.Will
C.Shall
D.Are
单项选择题
A.it must have rained
B.it must rain
C.it must be raining
D.it must have been raining
单项选择题
A.had gone
B.had set off
C.had left
D.had been away