问题补充：
--Good morning, sir! ?
-- Id like to buy a sweater for my daughter.
A. What can I do for you
B. What are you doing
C. How about the sweater
D. Can you help me
答案：
(答案→)A. What can I do for you
B. What are you doing
C. How about the sweater
D. Can you help me
解析：句意：——先生，早上好！我能为您做点什么？——我想给我的女儿买一件毛衣。A. What can I do for you我能为您做点什么？ B. What are you doing你正在做什么？ C. How about the sweater这件毛衣怎么样? D. Can you help me你能帮助我吗？根据Id like to buy a sweater for my daughter.可知此处是顾客想买一件毛衣，因此售货员见到顾客应先说：“我能为您做点什么？”故选A。
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