题目内容
20．I from Mr．Black since he moved to Beijing．I'll visit him when I go there．（ ）| A． | haven't heard | B． | won't hear | C． | don't hear | D． | didn't hear |
分析 翻译：自从布莱克先生搬到北京，我就没有听过他的消息．当我去那里时，我将会去拜访他．
解答 答案：A．句中有since he moved to Beijing，since引导的从句用过去时，主句用现在完成时，在这里的意思是自从布莱克先生搬到北京我就没听到他的消息，强调状态的延续．现在完成时的否定构成：主语+have/has+not+动词的过去分词，故选A．
点评 本题考查的是现在完成时，since引导的从句用过去时，主句用现在完成时．
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