单项选择题

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

A. elevate
B. launch
C. flourish
D. take off

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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
单项选择题
Not once in these years () the prices of these products.

A. we changed
B. have we changed
C. did we change
D. we have changed
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