单项选择题

She ______ working till he was seventy (七十) years old.

A．kept on
B．kept up
C．followed
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单项选择题
Great changes ______ in China since1978.
A．have been taken place
B．had taken place
C．have taken place
单项选择题
Reading aloud (大声地) is ______ to you.
A．help
B．helpful (有帮助的，有益的)
C．helpfully
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