单选题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 registeredB have registeredC registeredD were registered
题目
单选题
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