问题补充：
We have realized she is expecting is just an opportunity to test her ability.
A. that
B. which
C. what
D. where
答案：
A. that
B. which
(答案→)C. what
D. where
解析：C 考察名词性从句。Realize后面跟宾语从句， she is expecting在宾语从句中做主语，expecting后面缺少宾语，且指内容。故使用what作为引导词。故C正确。
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