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, （）.
单项选择题 The doctor tried to do an experiment to find out the （） of the medicine on the mice.
单项选择题 This is only one of the laundries in the district （） modem equipment.
