党的一大提出党成立后的中心任务是(),中国共产党的最高纲领和最低纲领是在党的第()次代表大会上提出的,正式决定跟国民党实行合作的是党的第()次代表大会。
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Some 200 ____ were presented at the conference.
A. paper
B. pieces of paper
C. papers
D. pieces of papers
Please supply it to those ___ running short.
A. food is
B. whose food is
C. foods are
D. whose foods are
Seventy percent ___ well-educated in this area.
A. is
B. are
C. has
D. have