单项选择题

The professor found himself constantly ______ the question: "How could anyone do these things"

A．poring
B．pondering
C．presiding
D．presuming
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单项选择题
Government reports, examination compositions, legal documents and most business letters are the main situations ______ formal language is used.
A．in which
B．at what
C．on which
D．in that
单项选择题
Connie was told that if she worked too hard, her health would ______
A．decay
B．deteriorate
C．descend
D．degrade
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