单项选择题

In 1969 two American astronauts _____ on the moon and walked on its rocky, dusty surface.

A．concentrate
B．based
C．landed
D．focused
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单项选择题
– Do you let your kids go out alone at night – _____ not!
A．Absolutely
B．Extremely
C．Actually
D．Eventually
单项选择题
My suitcase was so full that it didn’t have _____ for anything else.
A．spot
B．room
C．place
D．area
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