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
______, electrons are still smaller.
A．As atoms small are
B．As atoms smaller as
C．Small as atoms are
D．Smaller atoms as are
单项选择题
Tom looks so pale today. He ______ ill.
A．must be
B．had to be
C．should be
D．shall be
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