2. 外语
  3. If you had entered the office ten minutes ago, you______what we were talking about just now.

If you had entered the office ten minutes ago, you______what we were talking about just now.

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问题 If you had entered the office ten minutes ago, you______what we were talking about just now.
选项 A、would know
B、had known
C、would have known
D、should know
答案C
解析 虚拟语气题。在if引导的虚拟条件句中，“If you had entered…”表示与过去事实相反，意为“要是……，如果……”，主句应用“would／should／could／might+have+过去分词”结构，因此C为答案。表达与现在事实相反时，if条件句用一般过去时(be用were)，主句用“would／should／could／might+动词原形”；表达与将来事实相反时，if条件句用一般过去时或“should／were to+动词原形”，主句用“would／should／could／might+动词原形”。
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