2. 公务员
  3. —______have you been at this factory? —I’ve been here since 1993.

—______have you been at this factory? —I’ve been here since 1993.

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问题 —______have you been at this factory? —I’ve been here since 1993.
选项 A、When
B、How long
C、What time
D、How often
答案B
解析 句子的时态是现在完成时，表示过去某一时间开始并一直持续到现在的动作或状态。when和what time都表示时间点，不符合题意，how often表示频率，也不符合题意，只有B项表示时间段，符合题意。
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