单项选择题

The cost of traveling around the eight European countries can run as high ______ $2000.

A．to
B．as
C．by
D．for
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单项选择题
Study in moderation is agreeable as well as (health) ______ to human beings.
Study in moderation is agreeable as well as (health) ______ to human beings.
单项选择题
I felt so embarrassed that I couldn't do anything but ______ there when I first met my present boss.
A．to sit
B．sitting
C．sat
D．sit
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