【题目】The life-saving drug invented in 1897, which ________ aspirin, has helped increase the standard of people’s health greatly.
A. was called B. is called C. has been called D. had been called
在线课程【答案】B
【解析】
考查动词时态。句意：诞生于1897年的救命药，阿司匹林，极大地提升了人们的健康标准。Which引导非限制性定语从句，补充说明先行词drug，而该从句陈述客观事实，故用一般现在时，故B切题。