几道英语题
1.Theyarequiet,aren'tthey?
YEs.Theyareaccustomed_______atmeals.
A.totalkB.tonottalk
C.totalkingD.tonottalking
2.Anopportunityissomethingthat,________,bynomeanswillyougetback.
A.ifyouloseB.whenlose
C.oncelostD.afterlosing
帮忙解释一些,O(∩_∩)O谢谢