单项选择题

By the end of last week. 611 people from 49 countries （） to attend the meeting, with nearly half coming from the United States, Germany and Britain.

A. had registered
B. have registered
C. registered
D. were registered

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单项选择题
Having been praised by the teacher, the little girl ran back home, （）.

A. happily and satisfied
B. eager and excitedly
C. happy and satisfied
D. anxiously and excitedly
单项选择题
Although he knew little about the large amount of work done in the field, he succeeded （） other more well-informed experimenters failed.

A. as
B. unless
C. what
D. where
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