单项选择题

Skating can be good for you （） correctly.

A. though doing
B. though done
C. if done
D. if doing

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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

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

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