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9. Everybody______ in the hall where they were welcomed by the secretary.
A. assemble B. accumulated C. piled D. joined
accumulate 积累
gather 收集(到一起)，收割(庄稼)
collect 收集(带有某种目的的收集)
pile 堆到一起
compile 汇编，编辑
pilgrim 圣徒，朝圣者
analog 类比，类似物
analogy 类推
vt. 聚集，集合，装配
vi. 集合，聚集
