解释一道SAT语法题

问题描述:

解释一道SAT语法题
( Until revealing that she had been working )at a design firm,few of her friends realized that Amanda was interested in art.
A Until revealing that she had been working
B Having revealed that she had been working
C Until she revealed that she had been working
麻烦解释的清楚点

这其实是not...until的句型,few体现了句型中的not.Few of her friends realized that Amanda was interested in art,until she revealed that she had been working at a design firm.这是最原始的顺序,应该能够理解...