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参考答案:错
Peter couldn't concentrate____ what he was doing while his family were watching TV. [ ]
A. on
B. to
C. in
D. for
中国封建社会的手工业经营形态主要有()
①官营手工业
②民营手工业
③家庭手工业
④工场手工业
A.①②④
B.①②③④
C.①②③
D.②③④