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

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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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