问题
单项选择题
Annie Jump Cannon,______discovered so many stars that she was called "the census taker of the sky".
A. a leading astronomer,
B. who, as a leading astronomer,
C. was a leading astronomer,
D. a leading astronomer who
答案
参考答案：A
解析： 结构识别。
a leading astronomer是Annie Jump Cannon的同位语。