摘要http://www.manhattangmat.com/forums/gmatprep-math-f30.html
B: when combined狀語子句應該在that以內,否則沒有修飾物件
actually, in choice b, 'when' doesn't refer to anything - there's no time period to which it could logically refer - and that's the main issue with choice b. (if you interpret it literally, as you must, then it implies that (1) sometimes the vantage point was combined with the writing and sometimes it wasn't, and (2) it only made her valuable when it was combined with the writing talent. that doesn't make sense.)