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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Is she is my sister 她是我的姐妹
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