单项选择题

Scientists let us know that there is nothing ______ on the moon.

A. not live
B. live
C. living
D. lived
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单项选择题
Some of the stars are too far away ______.
A. to be seen
B. to see
C. seeing
D. seen
单项选择题
Are you ready to ______ for me in the business I'm too old to manage it. the father said to his son.
A. take off
B. take place
C. take away
D. take over
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