单项选择题

It is widely understood that advertising ______ not only to promote sales but also to upgrade a company's image.

(A) helps
(B) to help
(C) helping(g) help
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单项选择题
One of the major problems most small businesses encounter today is ______ advertising is often costly and often takes some time to begin working.
(A) because
(B) that
(C) What
(D) how
单项选择题
Since information technology makes ______ increasingly easy to find and work with outside resources, many companies are getting smaller in size.
(A) itself
(B) it
(C) them
(D) themselves
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