People sell their products advertisement in the newspaper.
A. by putting an
B. to put an
C. by putting a
D. putting an
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(答案→)A. by putting an
B. to put an
C. by putting a
D. putting an
解析：考查：介词by + doing 通过某种方式，advertisement 广告，它的发音以元音因素开头，所以一条广告用an advertisement，句意：人们卖产品通过在报纸上登广告的形式。所以选A。