单项选择题

I didn't notice her （） at the opening ceremony.

A. appear
B. appearing
C. to appear
D. appeared

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The scientific concepts can be ______ by words and diagrams.
A. conveyed
B. concluded
C. contained
D. continued
单项选择题
I bought three （） eggs.

A. dozen
B. dozens
C. dozen of
D. dozens of
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