2. 专升本
  3. —______you improved your work efficiency so much? —Oh, we have introduced some modern equipment.

—______you improved your work efficiency so much? —Oh, we have introduced some modern equipment.

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问题 —______you improved your work efficiency so much?
—Oh, we have introduced some modern equipment.
选项 A、How it is that
B、How is it that
C、How it was that
D、How was it that
答案D
解析 考查强调句和时态。句意：——你们是如何把工作效率提高这么多的?——哦，我们引进了一些现代化的设备。分析句子结构可知，此处应使用强调句的特殊疑问句结构，又由问句中的improved可知应用一般过去时。
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