Mary will not be relieved ______ David has been taken to the safety.A、ifB、when

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问题 Mary will not be relieved ______ David has been taken to the safety.

选项 A、if
B、when
C、unless

答案 C

解析 unless引导从句时，主句必须为否定，not…unless…表示“除非…否则就…”。

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