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    【题目】It's the second time that I __________ in Beijing. What great changes! It's years since I __________ here last time.

    A. went; had left B. have been; left

    C. had been; left D. have been; had left

    【答案】B

    【解析】句意:这是我第二次到北京。变化真大啊！自从上次离开这里有数年了。考查时态。在句型It is the +序数词+ time that...中that从句中用现在完成时；在句型It is+一段时间+Since...中since引导的从句中用一般过去时。

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