______ there is something else to discuss, I will declare the meeting closed.

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问题 ______ there is something else to discuss, I will declare the meeting closed.

选项 A、As
B、Though
C、Unless
D、While

答案C

解析 如果没有其他的事情要讨论,我就宣布散会。unless=if..not,意为“除非、如果不”。
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