Doing eye exercises_____your healthy.A.keepsB.to keepC.keptD.keeping到底选啥?

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Doing eye exercises_____your healthy.A.keepsB.to keepC.keptD.keeping到底选啥?

Doing eye exercises_____your healthy.A.keepsB.to keepC.keptD.keeping到底选啥?
Doing eye exercises_____your healthy.
A.keeps
B.to keep
C.kept
D.keeping
到底选啥?

Doing eye exercises_____your healthy.A.keepsB.to keepC.keptD.keeping到底选啥?
B
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就是B`

选A,doing eye exercises是动名词作主语,用单数