单项选择题

You should know better than ______ the risk of gambling.

[A] to run
[B] running
[C] to have run
[D] ran
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单项选择题
When the boy came back years later, he found ______ the empty old house there.
[A] none but
[B] none other than
[C] anything but
[D] no other than
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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