单项选择题
A) task C) research
B) experiment D) job
A.task
B.experiment
C.research
D.job
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单项选择题
A) for C) on B) about D) at
A.for
B.about
C.on
D.at
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单项选择题
A) primitive C) preliminary B) prime D) primary
A.primitive
B.prime
C.preliminary
D.primary
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