He ______ at the steel plant since 1949.A、was workingB、workedC、has been workin

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问题 He ______ at the steel plant since 1949.

选项 A、was working
B、worked
C、has been working
D、work

答案 C

解析现在完成进行时表示动作从过去的某个时刻开始，一直延续到现在，强调动作的延续。

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