单项选择题
21()
A.developing
B.developed.
C.development
D.develop
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单项选择题
22()
A.the
B.an
C.a
D.not
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单项选择题
Monkeys ______.
A.are left-handed
B.can use both hands equally well
C.are right-handed
D.like to use one hand more than the other
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