goodexercise.A．Climbinghillsis

__________ good exercise.

A．Climbing hills is	B．Climbing the hill is
C．The climbing hills are	D．The climbing of hills are

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A．to; of	B．on; off
C．in; on	D．on; of

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A．instead	B．instead of
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A．instead of	B．instead
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A．taking apart	B．giving away
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