单项选择题
22()
A.wherever
B.where
C.how
D.when
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单项选择题
21()
A.across
B.over
C.into
D.beyond
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单项选择题
It is difficult ______ a world record and even more difficult to ______ it.
A.keeping, set
B.keep, set
C.set, keep
D.to set, keep
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