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23. Everybody _____ in the hall where they welcomed by the secretary.
A. assembled B. piled C. joined D. accumulated
<assemble>
assemble (人群)聚集
assembly line 装配线
semblance 外表
resemble 相似，相像
take after 与某人长得像
</assemble>
<pile>
pile 堆积
compile=put together 编辑，汇编
</pile>
<accumulate>
accumulate 积累
cumulus 积雨云
cumulative 积累的，渐增的
</accumulate>
