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
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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
单项选择题
Though Mr. Johnson is competent, ______ remains to be seen whether or not he can break the sales record for the month of August.
(A) that
(B) what
(C) it
(D) which
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