单项选择题

Johnson's younger brother, though 6 years old, is very quick () doing calculations.

A．of
B．on
C．in
D．by

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单项选择题

(), if you like politics, polls can be great entertainment.

A．At a least
B．At end
C．At the very least
D．At last

单项选择题

There's a knock at the door. Who () be

A．must be
B．must it
C．can he
D．can it

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