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
Nancy was surprised that they have ______ . They seemed to be a happy couple.
[A] split up
[B] broken down
[C] fallen through
[D] cut off
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