单项选择题

In the meantime, the question facing business is whether such research is ______ the costs.

A. worth
B. worth of
C. worthy
D. worthwhile
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单项选择题
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A. could
B. did
C. would
D. was
单项选择题
Mr. Milton prefers to resign ______ part in such dishonest business deals.
A. than take
B. than to take
C. rather than take
D. rather than to take
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