问题
You’dsound a lot more polite if you make a request ______ a question
A:The definition of ecotourismis beyond words
B:It takes ecology and cultureinto consideration
C:You may not be very familiarwith "ecotourism"
D:shouldn’t
B:It takes ecology and cultureinto consideration
C:You may not be very familiarwith "ecotourism"
D:shouldn’t
正确答案是：
