There were two boys in the lab, _______ did the experiment successfully.
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A
the clever of whom
B
the cleverer of whom
C
the cleverer of them
D
the more clever of them
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Mark Twain worked for several years as a pilot on a steamboat, taking passengers up anddown the Mississippi, the great river ___flows from the north of the US near the Canadianborder.
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A
as
B
what
C
which
D
who
It is recognized that the part ___ the UN plays in international relations is important.
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A
in which
B
where
C
that
D
of which