单项选择题

He drove fast and arrived about an hour _________ the meeting schedule.

A. in advance
B. before
C. ahead of
D. in front of
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The atmosphere is as much a part of the earth as _______ its soil and water of its lakes, rivers and oceans.
A. has
B. do
C. is
D. are
单项选择题
You will be there before 9, _______ you don't waste time.
A. provided
B. unless
C. though
D. until
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