相关考题
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单项选择题
They were leaning（），facing each other.
A.forward
B.towards
C.back
D.against -
单项选择题
I had nothing to add（）my earlier statement.
A.to
B.up
C.with
D.for -
单项选择题
（）has made smallpox a very rare disease.
A.Infection
B.Treatment
C.Vaccination
D.Cure
