一句话

wenyiwendy

“because it relies on a series of unproven, and doubtful, assumptions.”
范文中看到这句话，总觉得怪怪的，中间两个逗号去掉的话会怎样？而且unproven 和 doubtful 是不是有堆砌之嫌？
感谢诶~

aeoluseros

如果是指, and noun, GMAT里面有这样的表达。
121.    Sales of wines declined in the late 1980s, but they began to grow again after the 1991 report that linked moderate consumption of alcohol, and particularly of red wine, with a reduced risk of heart disease.
对于unproven和doubtful不算重复，因此也不堆砌。