Isn't it about the time you _to do morning exercises A.beganB.begin C.should begin D.have begun选择那个答案?求详解,谢谢!

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Isn''titaboutthetimeyou_todomorningexercisesA.beganB.beginC.shouldbeginD.havebegun选择那个答案?求详解,谢谢!Isn''t

Isn't it about the time you _to do morning exercises A.beganB.begin C.should begin D.have begun选择那个答案?求详解,谢谢!
Isn't it about the time you _to do morning exercises A.beganB.begin C.should begin D.have begun
选择那个答案?求详解,谢谢!

Isn't it about the time you _to do morning exercises A.beganB.begin C.should begin D.have begun选择那个答案?求详解,谢谢!
A