–Do you want the red hat?Yes I do.A. buyB. buysC. to buyD. take

问题补充：

–Do you want the red hat? --Yes, I do.

A. buy

B. buys

C. to buy

D. take

答案：

A. buy

B. buys

(答案→)C. to buy

D. take

解析：want后跟不定式结构即：want to do sth.想做某事。