My cousin ( ) the Science Camp .A.has come B.has signed up for C.has filled out D.has entered为何要选B呢?

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My cousin ( ) the Science Camp .A.has come B.has signed up for C.has filled out D.has entered为何要选B呢?
My cousin ( ) the Science Camp .A.has come B.has signed up for C.has filled out D.has entered
为何要选B呢?

My cousin ( ) the Science Camp .A.has come B.has signed up for C.has filled out D.has entered为何要选B呢?
肯定是说签约的意思啊,后面这个应该是个组织!

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