单项选择题

He always included something above the understanding of his hearers in order to prevent them from becoming______and to stimulate their desire to learn more.

A. pessimistic
B. complacent
C. perplexed
D. complicated
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单项选择题
His strange behavior had greatly ______ me and my friends as well that evening.
A. perplexed
B. exhausted
C. exclaimed
D. exceeded
单项选择题
They conceded that her statement was true（）

A. proved
B. doubled
C. denied
D. admitted
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