By the end of last week 611 people from 49 countries _____ to attend the meeting, with nearly half coming from the United States

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问题 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.

选项 A、had Registered
B、have Registered
C、Registered
D、were Registered

答案A

解析
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