Volunteers will be on the frontline in weling the world to China,________ in beautiful uniforms and using English to help visitors．A.dressedB.dressingC.to dressD.being dressed
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A解析考查非谓动词。此题若不知dress的特殊用法，极易选B，且后面也正好有一个using相对应，但是dress为及物动词,可构成dress sb．/oneself in sth．或be dressed in sth．结构，另外，表状态，