单项选择题

Would you like a cup of coffee first, () shall we get down to business right now

A. then
B. when
C. or
D. otherwise

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It takes a great deal of power of () a spaceship into space.

A. elevate
B. launch
C. flourish
D. take off
单项选择题
()second thoughts I'm quite content to stay for the time being.

A. At
B. On
C. In
D. As
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