Question

【题目】It was 1897________ a European chemist called Dr. Felix Hoffman produced aspirin from this chemical.

A. that B. while C. when D. in which

Answer 1

【答案】C

【解析】

试题分析：考查定语从句。句意：那是一位欧洲的名叫Felix Hoffman的博士药剂师从这种药品中制造出阿司匹林的1897年。空后的定语从句缺少时间状语，while不可以引导定语从句；若看作强调句型，则1897前应用介词in。故可知选C项。