单项选择题

()a boy of ten, he started working to support his family.

A．Being
B．While
C．Because of
D．When still

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单项选择题
The new research project was led by the()engineer.

A．main
B．major
C．chief
D．primary
单项选择题
All but one()going to take part in the sports meet()tomorrow.

A．is; which is to hold is
B．are; to be taken place
C．are; to be held
D．that is to take place
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