china ____two large groups to the U.S since last year.填has been sent吗?为什么呢?

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china____twolargegroupstotheU.Ssincelastyear.填hasbeensent吗?为什么呢?china____twolargegroupstotheU.Ssince

china ____two large groups to the U.S since last year.填has been sent吗?为什么呢?
china ____two large groups to the U.S since last year.
填has been sent吗?为什么呢?

china ____two large groups to the U.S since last year.填has been sent吗?为什么呢?
是的.since 是信号词,这是现在完成时的标志