______ he retired, Mr. Wang had worked in the factory for 30 years.

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问题 ______ he retired, Mr. Wang had worked in the factory for 30 years.

选项 A、Whenever
B、By the time
C、The moment
D、Since

答案B

解析 by the time引导时间状语从句,表示“到……为止”其主句常用完成时。其他词与题意不符:whenever应译成“不管何时”;the moment相当于as soon as,译成“一……就……”;since,译成“自从……”,故选B。
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