问题补充：
Please ask the salesgirl .
A. how much did it cost
B. how much it costs
C. how much it costed
D. it cost how much
答案：
A. how much did it cost
(答案→)B. how much it costs
C. how much it costed
D. it cost how much
解析：考察宾语从句及时态。句意：请问问这个售货员它卖多少钱。可知从句叙述的是一个客观存在的事实，故用一般现在时态。宾语从句一般为陈述语序，疑问词提前，故选B。
