please help me with the qestion and please tell me why you choose the answer.thang you!___has long been proved ,exercises helps to keep one' figue. A.It B.What C.As D.As it

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pleasehelpmewiththeqestionandpleasetellmewhyyouchoosetheanswer.thangyou!___haslongbeenproved,exercis

please help me with the qestion and please tell me why you choose the answer.thang you!___has long been proved ,exercises helps to keep one' figue. A.It B.What C.As D.As it
please help me with the qestion and please tell me why you choose the answer.thang you!
___has long been proved ,exercises helps to keep one' figue. A.It B.What C.As D.As it

please help me with the qestion and please tell me why you choose the answer.thang you!___has long been proved ,exercises helps to keep one' figue. A.It B.What C.As D.As it
C
as 引导的非限定性定语从句,放在句首.

A

C,as 就像,it省略,exercises代替it