单项选择题

A fire ______ last night in his house and the fireman came and

A．broke out ... put down
B．broke in ... put out it
C．broke out ... put it out
D．broke through... put it down
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单项选择题
The more he tried to help her, ______ she seemed to appreciate it.
A．less
B．lesser
C．the less
D．the lesser
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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