现有格式化输入语句，scanf("x=%d]，sum]y=%d，line]z=%dL"，&x，&y，&z)；，已知在输入数据后，x，y，z的值分别是23，56，78，则下列选项中正确地输入格式的是

A) 23，56，78 ＜Enter＞
B) x =23,y=56,z=78 ＜Enter＞
C) x=23C,sumy=56,z=78 ＜Enter＞
D) x=23] ,sum]y=56 ,line]z=78 ＜Enter＞
[注]：”]”表示空格，＜Enter＞表示回车

I walked slowly through the market, where people () all kinds of fruits and vegetables: I studied the prices carefully and bought what I needed.

A. sell

B. were selling

C. had sold

D. have sold