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We were busy ________ (get) things ready for the trial production when he phoned us.
Only when you have obtained sufficient data ________ come to a sound conclusion.
Senior members of the staff competed eagerly ________ the position of sales manager in the company.
新中国初期建立社会主义国营经济的主要途径是 _________。
规定取消公行制度,外商可与华商直接交易的条约是 ()