单项选择题
A.–（不填） B.will C.would D.can
If there were life on Mars, such life forms（）unable to ...
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
He is over fifty, but he looks as though he（）only in hi...
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
（）I got a first, I'd stay in university and I'd do a po...
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
