单项选择题

He was amazed at ______ he saw.

A．that
B．what
C．which
D．whom
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单项选择题
I'm very much obliged to you ______ the information.
A．on
B．for
C．with
D．of
单项选择题
He is at ______ in his description of country life.
A．better
B．best
C．his better
D．his best
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