3．________ the teacher's desk，there is a computer．（　�。�
A．InB．OnC．AtD．of

分析 在老師的桌子上，有一臺電腦．

解答 答案：B．考查介詞．句意"在老師的桌子上，有一臺電腦．"．in在…里．on在…上．a(chǎn)t在幾點或小地點．of屬于…結(jié)合語境"老師的桌子"，"有一臺電腦．"，應該用介詞on在…上．答案是B．

點評 考查介詞用法，這個知識點很廣泛，有一些固定用法，需要日常積累，結(jié)合語境選擇正確介詞完成習題．

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