so far only a few countries have_____(succed)sent people into space

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so far only a few countries have_____(succed)sent people into space
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so far only a few countries have_____(succed)sent people into space
so far only a few countries have_____(succed)sent people into space

so far only a few countries have_____(succed)sent people into space
successfully
简析:have sent构成了现在完成时的谓语,你所填入的词只能是充当状语的adv.