单项选择题

It had never _____ to him that he might be falling in love with her.

A．happened
B．referred
C．occurred
D．came
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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
单项选择题
– Do you let your kids go out alone at night – _____ not!
A．Absolutely
B．Extremely
C．Actually
D．Eventually
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