问题描述：
_____middle school students allowed to use mobile phones at school A.do b,did c,are d,can
Yesterday my sister had her computer___at the supermarket.
A,mend B to mend C mended Dmending
instead of 是不是加ing啊?
请回答详细些,说明下理由,
Yesterday my sister had her computer___at the supermarket.
A,mend B to mend C mended Dmending
instead of 是不是加ing啊?
请回答详细些,说明下理由,
问题解答：
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