Early to bed ,early to rise , _____is bad for your health.A.staying up B.getting up C.waking up D.going up 我知道是选A,但是为什么要加ing呢?

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Early to bed ,early to rise , _____is bad for your health.A.staying up B.getting up C.waking up D.going up 我知道是选A,但是为什么要加ing呢?
Early to bed ,early to rise , _____is bad for your health.
A.staying up B.getting up C.waking up D.going up 我知道是选A,但是为什么要加ing呢?

Early to bed ,early to rise , _____is bad for your health.A.staying up B.getting up C.waking up D.going up 我知道是选A,但是为什么要加ing呢?
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