Please be advised that every night shift worker is eligible for free parking ______on duty.

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问题 Please be advised that every night shift worker is eligible for free parking ______on duty.

选项 A、during
B、after
C、while
D、still

答案C

解析语法：连词1．选项由连词和介词构成。2．连词while后直接接从句，从句中“主语+动词”(every night shift is)这一部分被省略。因此(C)为正确选项。

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