相关考题
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单项选择题
If there were life on Mars, such life forms（）unable to survive on earth
A.is
B.are
C.would be
D.will be -
单项选择题
He is over fifty, but he looks as though he（）only in his thirties.
A.were
B.is
C.will be
D.has been -
单项选择题
（）I got a first, I'd stay in university and I'd do a postgraduate research degree.
A.As
B.Since
C.When
D.If
