So far many students ______(volunteer) to do some work for the show.

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Sofarmanystudents______(volunteer)todosomeworkfortheshow.Sofarmanystudents______(volunteer)todosomew

So far many students ______(volunteer) to do some work for the show.
So far many students ______(volunteer) to do some work for the show.

So far many students ______(volunteer) to do some work for the show.
have volunteered

应该是have volunteerred
r应该双写的!!!

就应该用have volunteered。

have volunteered
so far是完成时的标志

have volunteered
用完成时