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單項選擇題

If the man（）succeed，he must work as hard as he can.

A.will
B.is to
C.is going to
D.should

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單項選擇題

If he was fitter, he（）live longer.

A.–（不填）
B.will
C.would
D.can

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