用be动词正确形式填空 she ( ) is my sister
is 之前加 单词,只能加一个介词:
really:really is
definitely:definitely is
possibly:possibly is
probably:probably is
certainly:certainly is
likely:likely is
unlikely:unlikely is
等等
She really is my sister.
她真的是我的姐姐/妹妹.
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