Is _______ necessary_______ the workers wear uniforms at work?
A. it, for          B. this, to       C. it, that
C

試題分析：句意：對于工人們來說上班穿制服是有必要的嗎？It is +形容詞+for sb to do 對于某人來說做某事是怎么樣的，故選C。
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