I can't decide____ A.to buy which one B.which one to buy C.to buy which D.which to buy one为什么这么选?

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Ican''tdecide____A.tobuywhichoneB.whichonetobuyC.tobuywhichD.whichtobuyone为什么这么选?Ican''tdecide____A.to

I can't decide____ A.to buy which one B.which one to buy C.to buy which D.which to buy one为什么这么选?
I can't decide____ A.to buy which one B.which one to buy C.to buy which D.which to buy one
为什么这么选?

I can't decide____ A.to buy which one B.which one to buy C.to buy which D.which to buy one为什么这么选?
根据decide可以排除AC,不能用to
根据语序,D也错
选B

D

选A。

选B

B

B 固定。 to do 放后面 something to buy