【題目】________ around the beautiful campus, they were taken to the classroom to observe a maths lesson.

A．To be shownB．Having shown

C．Having been shownD．To show

【答案】C

【解析】

試題分析：句意：參觀完美麗的校園后，他們被帶去教室聽了一堂數(shù)學課。句中動詞發(fā)生有先后，先發(fā)生的在句中作狀語，故用動詞-ing形式的完成時；因為主語是they，與動詞show是被動關(guān)系，故用被動語態(tài)，故選C。

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