摘要： (do)exercise is good for our health.
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_______ good for our health.
| A．Do exercise is | B．Doing exercise is | C．Do exercises are | D．Doing exercises are |
_______ good for our health.
A. Do exercise is B. Doing exercise is C. Do exercises are D. Doing exercises are
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_________morning_________ good for our health．
A．Do；exercise is B．Do；exercises is
C．Doing；exercises are D．Doing；exercises is
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