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

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Ploughs and other agricultural implements were （）on display at the recent exhibition.

A. equations
B. playthings
C. tools
D. machinery
单项选择题
After years of research, Charles Drew devised a procedure for preserving plasma（）

A. transporting
B. saving
C. reusing
D. labeling
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