【題目】It was 1897 ____a European chemist called Dr. Felix Hoffman produced aspirin from this chemical.

A.thatB.howC.whenD.which

【答案】C

【解析】

考查定語從句。句意:就是在1987年一個(gè)叫做Felix Hoffman博士的歐洲化學(xué)家用這種化學(xué)制品制造出了阿司匹林。分析句子結(jié)構(gòu)可知,前句It was 1897和后句都是完整的句子,不缺主賓語,考慮定語從句,句意上不難理解,后句描述的應(yīng)該是在1897年發(fā)生的事情,即先行詞作時(shí)間狀語,要用關(guān)系副詞when。故選C項(xiàng)。

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