问题补充：
If you haven’t got the service advertised on their website, they you have to complain about it.
A. choice
B. purpose
C. right
D. reason
答案：
A. choice
B. purpose
C. right
(答案→)D. reason
解析：考查名词;A. choice选择B. purpose目的C. right权利D. reason理由，原因，have reason to do sth有理由做…，句意：如果你没有得到网站广告中的服务，你有理由投诉它。选D。
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