单项选择题

It is true that each advertising medium is very useful to us, but each has advantages and disadvantages, ______ it

(A) isn't
(B) doesn't
(C) won't
(D) haven't
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The economy as a whole has been declining in that country for years, ______ the computer industry has expanded steadily.
(A) so
(B) yet
(C) since
(D) unless
单项选择题
DVDs are most effective ______ the discs are sturdy and the crisp images do not degrade with repeated showings.
(A) in that
(B) except that
(C) for that
(D) with that
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