◎ 题干
Beijing ____ its best air quality in the first six months of last year.
[     ]
A. saw
B. sees
C. had seen
D. was seeing
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Beijing ____ its best air quality in the first six months of last year. [ ]A. saw B. sees C. had seen D. was seeing …”主要考查了你对  【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。