单项选择题

As we know, ______ most dangerous enemies are those who pretend to be friends.

A．不填;不填
B．the; the
C．the; 不填
D．不填;the
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单项选择题
--The phone is ringing.--Who could ______ be It is already midnight.
A．he
B．it
C．this
D．there
单项选择题
The boy has four appels: two yellow ______ and two red
A．one; one
B．one; ones
C．ones; other
D．ones; ones
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