She a student ten years ago, but she a teacher now.
A. is; was
B. was; is
C. was; was
答案:B
近代“诗界革命”的旗帜是哪位诗人?
()在自然界分布很广,虽然其在地壳元素总量中占0.14%,但它却是地球上形成化合物最多的元素。