who is singsing in the next room It ( ) my sister.She is going to sing at the party this Sunday.

分类: 作业答案 • 2021-12-20 08:23:07

问题描述：

who is singsing in the next room It ( ) my sister.She is going to sing at the party this Sunday.
A.can't be
B.must is
C.must be
D.was
谢啦、、

答

C
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