I believe that the 21st century is one ______ China will become one of the most powerful economic countries.
#76573
A
which
B
that
C
when
D
where
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Mr. Obama paid a visit to China in November, 2009, _______, needless to say, must strengthen the Sino-US ties.
#77381
A
what
B
that
C
which
D
it
The Nuclear Security Summit is an initiative of Mr. Obama, considers nuclear terrorism to be one of the greatest threats to international security.
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A
which
B
what
C
who
D
whom
The engineer __________ my father works is about 60 years old.
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A
to whom
B
on whom
C
with whom
D
with which