–How is your grandma?

--She’s fine. She used to_______ TV at home after supper. But now she is used to_____ out for a walk.  

A．watch, go

B．watching, go

C．watching, going

D．watch, going

一批零件投入55件，工人自检时发现废品5件，提交50件，检验合格45件，返工后合格3件，让步许可2件，该工人一次提交合格率为（）。

A、96%

B、90%

C、82%