单项选择题
A.upon
B.for
C.as
D.to
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单项选择题
A.whatB.thatC.whichD.it
A.what
B.that
C.which
D.it
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单项选择题
A.learnsB.realizesC.studiesD.understands
A.learns
B.realizes
C.studies
D.understands
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