Iknowthreehoursofoutdoorexerciseaweekgoodformyhealthbutwhenandwherehardformetodecide.A.are;remainB.is;remainC.are;remainsD.is;remains

题目详情

I know three hours of outdoor exercise a week ___good for my health but when and where____ hard for me to decide.

A. are; remain B. is; remain C. are; remains D. is; remains

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