Which dress do you like best， madam？ sorry I can not decide ？ now
a to buy which one b. by which one c which one to buy d which i should buy it
选项是C。
1.decide to do sth的意思是：“决定去做某事”
2.decide sth的意思是：“决定某事”
3.decide which one to buy的意思是：“决定买哪件”。【不定式to buy】做后置定语，修饰【which one】。
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