单项选择题

But from the start of their experiments, the Wright brothers found that they needed money to pay () their research.

A. back
B. down
C. for
D. off

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By no means () create or destroy energy.

A. we can
B. we can't
C. can we
D. shall we
单项选择题
They have bought the cottage () reselling it at a profit.

A. on account of
B. with a view to
C. in regard to
D. as a result of
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