_____middle school students allowed to use mobile phones at school A.do b,did c,are d,canYesterday my sister had her computer___at the supermarket.A,mend B to mend C mended Dmendinginstead of 是不是加ing啊?请回答详细些,说明下理由,

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,