單項選擇題

If he was fitter, he（）live longer.

A.–（不填）
B.will
C.would
D.can

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單項選擇題

If there were life on Mars, such life forms（）unable to survive on earth

A.is
B.are
C.would be
D.will be

單項選擇題

He is over fifty, but he looks as though he（）only in his thirties.

A.were
B.is
C.will be
D.has been