单项选择题

It's the first time that she has been to the United States, ______

A) isn' t she
B) hasn' t she
C) isn' t it
D) hash' t it
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I walked eight miles today. I never guessed that I could walk ______ far.
A) that
B) more
C) such
D) as
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The streets are all wet. It ______ last night.
A) must be raining
B) must have been raining
C) had to rain
D) must have rained
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