All workers should carry out their normal duties during the safety inspection tomorrow ________ otherwise instructed.

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问题 All workers should carry out their normal duties during the  safety  inspection tomorrow ________ otherwise instructed.

选项 A、through   
B、unless
C、despite
D、about

答案B

解析 句子表示“如果没有收到其他的指示”,因此B项意为“如果不……”为正确的答案。
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