单项选择题

Mr. Smith ______ working till he was seventy years old.

A．kept up
B．kept on
C．kept to
D．kept out
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单项选择题
It ______ John and Kate who helped me the other day.
A．is
B．was
C．are
D．were
单项选择题
______ your help we were successful.
A．According to
B．But for
C．Owing to
D．As for
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