单项选择题

He ______ coughing day and night, but he refused to go to see a doctor.

A．kept out
B．kept on
C．kept off
D．kept up
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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
单项选择题
This page need ______ again.
A．being checked
B．checked
C．to check
D．to be checked
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