No letters ____from her since she went to work in Africahave been receivedhas been receivedreceivedare received哪个\?为什么
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![No letters ____from her since she went to work in Africahave been receivedhas been receivedreceivedare received哪个\?为什么](/uploads/image/z/7340488-16-8.jpg?t=No+letters+____from+her+since+she+went+to+work+in+Africahave+been+receivedhas+been+receivedreceivedare+received%E5%93%AA%E4%B8%AA%5C%3F%E4%B8%BA%E4%BB%80%E4%B9%88)
No letters ____from her since she went to work in Africahave been receivedhas been receivedreceivedare received哪个\?为什么
No letters ____from her since she went to work in Africa
have been received
has been received
received
are received
哪个\?为什么
No letters ____from her since she went to work in Africahave been receivedhas been receivedreceivedare received哪个\?为什么
我觉得是has been received
no letters谓语动词用单数