单项选择题


A．were here
B．was here
C．were there
D．was there
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单项选择题
A．narrowerB．narrowC．widerD．wide
A．narrower
B．narrow
C．wider
D．wide
单项选择题
The structure of aircraft ______ all the time.
A．is being changed
B．has been changed
C．is been changed
D．is being changing
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