单项选择题

To tell you the truth, never before ______ seen so many candidates competing for so few vacancies our company has to offer.

(A) we have
(B) we had
(C) have we
(D) had we
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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
单项选择题
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
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