单项选择题

By teaming up, we finally solved the thorny problem that might ______ never have been solved by one person alone.

(A) solely
(B) fully
(C) further
(D) otherwise
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单项选择题
Paul is a man ______ I believe has the best understanding of what it is that makes our products different from others on the market.
(A) who
(B) whom
(C) whose
(D) how
单项选择题
Before buying a factory ______ setting up one of your own in that area, you should carefully evaluate the security risks there.
(A) so that
(B) nor
(C) or
(D) so
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