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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单项选择题
The more people surveyed, () meaningful are the results.

A．more the
B．the more
C．more
D．the much
单项选择题
How close adults are to their youngsters () a strong influence on the development of the children's character.

A．have
B．has
C．having
D．to have
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