单项选择题

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
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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
单项选择题
The hero of the story was an artist ______.
A. in his thirty
B. in his thirty's
C. in his thirtieth
D. in his thirties
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