單項(xiàng)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(xiàng)選擇題

If he was fitter, he（）live longer.

A.–（不填）
B.will
C.would
D.can

單項(xiàng)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