This is the most beautiful national park_____.I have ever visited

A.I
B.which
B.where
C.that
D.what

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调频信号的瞬时频率正比于()
A.UΩ
B.uΩ(t)
C.|uΩ(t)|
问答题
Although my grandpa is very old, he is not slow____ mind to learn how to set up an Internet account.
A.on
B.to
C.in
D.at