单项选择题

(Historically) (there) (has been) (only) two major factions(部分) in the Republican Party -- the liberals and the conservatives.

A．Historically
B．there
C．has been
D．only
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单项选择题
(It) was (her) (who) represented her country in the United Nations and (later) became ambassador (大使) to the United States.
A．was
B．her
C．who
D．later
单项选择题
Although we are (concerned with) the problem of energy sources, we (must not) fail (recognizing) the need (for) environmental protection.
A．concerned with
B．must not
C．recognizing
D．for
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