_______can help you keep healthy. A．Do exercise B．Doing exercise C．Do exercises D．Doing
_______canhelpyoukeephealthy.A．DoexerciseB．DoingexerciseC．DoexercisesD．Doingexercises...
_______can help you keep healthy. A．Do exercise B．Doing exercise C．Do exercises D．Doing exercises
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| B |
| 试题分析：句意：锻炼可以帮助你保持健康。动名词短语做主语，exercise为不可数名词意为“锻炼，运动”；故选B。 |
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