求助两道英语选择题
1.I'mverygladtoknowthatmybosshasgenerouslyagreedto__writeoff__mydebtinreturnforcertainservices.
AtakeawayBcutoutCwriteoffDclearup
2.Mr.Jones_attened__theconferenceinTokyolastyear.
AattenedBparticipatedCpresentedDtookpart
两题答案已经知道,想知道其他选项的意思,为什么不适用,还有certainservices是什么意思?谢谢了