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(tái)電腦．

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

點(diǎn)評(píng) 考查介詞用法，這個(gè)知識(shí)點(diǎn)很廣泛，有一些固定用法，需要日常積累，結(jié)合語(yǔ)境選擇正確介詞完成習(xí)題．

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