It will be at least 10 days______they finish cleaning up the typhoon-stricken village.

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问题 It will be at least 10 days______they finish cleaning up the typhoon-stricken village.

选项 A、until
B、before
C、since
D、when

答案B

解析 考查连词。句意为“他们需要至少10天才能清理完受台风袭击的村庄”。until“直到”,常与not连用构成“直到……才”;before“在……之前”,符合题意;since“自从”;when“当……时候”。故选B。
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