单项选择题

Flying as an airline passenger is often a memorable experience, but there are times ______ the experience is memorable for all the wrong reasons.

(A) where
(B) how
(C) when
(D) which
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单项选择题
Mr. Armstrong is expected to take ______ of the newly built factory that specializes in manufacturing all kinds of antique furniture.
(A) chance
(B) duty
(C) blame
(D) charge
单项选择题
One way or another, management has to do something to increase worker productivity, ______ the company will face ruin.
(A) and
(B) so
(C) but
(D) or
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