单项选择题

______ to his research work, the professor cared little about any other things.

A. Devoting
B. Devoted
C. Having devoted
D. To devote
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To get a high score ______.
A. working hard is needed
B. one must work hard
C. working hard is very important
D. requirement is what is needed
单项选择题
About two ______ took part in the sports meet last month.
A. hundred people
B. hundreds people
C. hundreds of people
D. hundreds peoples
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