问题补充：
I saw Mary dancing at the party and on such she was really excellent.
A. scenes
B. situations
C. positions
D. occasions
答案：
A. scenes
B. situations
C. positions
(答案→)D. occasions
解析：名词辨析。A现场；B情景；C职位；D情景；本题的四个选项中只有D项occasion与介词on连用；B项的situation是与介词In连用的。句意：我看见Mary在聚会上跳舞，在这种情况里，她是相当优秀的，故D正确。
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