sat语法题

jieshan8899UID: 2251428

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我是帮小孩问三道语法题,很急的问题,请帮忙看看!
8 ]2 ?! B) k, B2 z原题(537/6)
Naomi and Charles will represent Ammonton High in the debating contest, their work in this having been excellent this year.
(A)        contest, their work in this having been excellent this year
(B)        contest; they have done excellent work this year in this
9 N. j& A" L: U9 E# w(C)        contest, for this year they have done excellent work in this
(D)        contest, for their work as public speakers has been excellent this year
# y9 I* t$ D! X(E)        contest; their work as public speakers having been excellent this year
- q5 u2 z% }  ?7 A; t6 S$ ethis为何指代不清?代词指代不清不是其上文没有其对应所指吗?现在,我认为this与前文的the debating contest

杀生玲UID: 2204304

全句的逻辑应该是：因为他俩能说（^_^），所以被选去代表AH去debate。如果this代表一个contest的话，这个contest已经是持续了“this yea”了，逻辑不通吧。所以this应该指领域——公众演讲。