单项选择题

I have two grammars, ______ are of great use.

A. all of which
B. either of which
C. both of that
D. both of which
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单项选择题
Do you know the man ______
A. whom I spoke
B. to who spoke
C. I spoke to
D. that I spoke
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We all know the truth ______ there are air, water and sunlight there are living things.
A. where
B. wherever
C. that
D. that wherever
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