单项选择题

Witnesses who ______ in a courtroom must swear to tell the troth when they speak for or against the person being tried.

A．modify
B．testify
C．satisfy
D．qualify
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单项选择题
He is often inclined to ______ in other people's affairs, which is none of his business.
A．manipulated
B．lumbered
C．meddle
D．littered
单项选择题
The political future of the president is now hanging by a ______.
A．thread
B．cord
C．string
D．rope
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