I went to shanghai last week I visited the World Expo.A. WhenB. WhereC. WhichD. that

问题补充：

I went to shanghai last week,I visited the World Expo.

A. When

B. Where

C. Which

D. that

答案：

A. When

(答案→)B. Where

C. Which

D. that

解析：考察连词，根据句子结构可知，该句为非限制性定语从句，先行词是shanghai在后面的定语从句中充当地点状语，

句意为，我上个兴趣去了上海，在那里我参观了世博会

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