题目

—How long do you think it is ________ he arrived here? 　　　　—No more than half a year, I believe. 　　A. when　　　　 B. that　　　　　C. before　　　　D. since 答案：D　 解析: 与下文的答语相连，完整结构是“从他来之后有半年了”。

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