The workers demanded that their employer_____ their working conditions. 
A．had improvedB．would improveC．improveD．will improve
C

試題分析：考查虛擬語氣：句意：工人們要求他們的老板改善工作條件。主句的謂語是demand，謂語動詞用虛擬語氣，用should do，should可以省略，選C。
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