She a student ten years ago, but she a teacher now.
A. is; was
B. was; is
C. was; was
答案:B
I don’t think ________ possible to master a foreign language without much memory work.
A.this
B.that
C.its
D.it
企业不抢先研制开发新产品,而当市场上出现新产品,就立即进行仿制或寻找新产品的缺点而加以改进创新,以生产出功能、款式、包装等更好的产品,这样的新产品开发战略属于()。
A.进取战略
B.紧随战略
C.保持地位战略
D.冒险战略