The machine will continue to make much noise we have it repaired.A、whenB、becaus

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问题 The machine will continue to make much noise we have it repaired.

选项 A、when
B、because
C、if
D、unless,

答案 D

解析句意：如果我们不把机器修理一下，它就会一直发出噪音。本题考查条件状语从句。unless引导条件状语从旬，表明如果不按照状语从句中的建议行动，就会造成某种后果。

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