單項(xiàng)選擇題

If he was fitter, he（）live longer.

A.–（不填）
B.will
C.would
D.can

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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(xiàng)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