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left, worked has left, has worded left, has worked has left, worded
left; left has left; has left left; has been away leave; has been away
has left; ago had left; ago left; ago had left; before
has come; had left has been; has left
has come; left has been; left
have left has left
left has been away from
left;worked has left;had worked left;has worked has left;worked
has come; had left has been; has left has come; left has been; left
1eft was leafing has left had left
has been to；left；will come back has gone to；left；will be back has been in；has left；would come back has gone to；left；has been back
went；left has gone；left has been；has left has left；went
B.C.D四个选项中，选出可以填入空白处的最佳选项。 21. Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight against SARS, so we had not enough time for a talk. A. just left has just left is just leaving was just leaving
has come ; has left has been ; has left has come ; left has been ; left
was; left was; has left has been; left has been; has left
has left left was leaving had left
was leaving left had left has left
has left leaves left was leaving
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