问题补充：
－All the dresses look nice. I can’t decide .
－I think the orange on is the best.
A. which one can I buy
B. what shall I buy
C. which one I should buy
D. whether I can buy one.
答案：
A. which one can I buy
B. what shall I buy
(答案→)C. which one I should buy
D. whether I can buy one.
解析：此题重点考查宾语从句的语序问题，无论哪种句式作宾语从句都要用陈述句语序。
