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
【正确答案】
A
【答案解析】
解析：结构识别。a leading astronomer是Annie Jump Cannon的同位语。
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