单项选择题

The President followed historical ______ in forming the Cabinet.

A．precedent
B．herald
C．ancestor
D．forerunner
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单项选择题
He is the most brilliant pianist ______ I have ever met.
A．which
B．that
C．who
D．whom
单项选择题
In 1914, an apparently insignificant event in a remote part of Eastern Europe ______ Europe into a great war.
A．plunged
B．imposed
C．pitched
D．inserted
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