during the 1980's , the income gap between the richest and the poorest Americans widened significantly ,while continuing to expand in the 1990's 6 ]$ M [7 j8 M9 H5 r" A+ J% Y5 }0 |3 v
, z0 H% K3 {/ S为什么不对呢?黄金规则二不是说while 后可以省略it is 吗?: _6 y$ B! |. m
这句话的while continuing to expand 为什么错了?:confused: + G. S7 X! h2 |* A4 n; U6 }, C* D5 Z0 b4 l1 m# T
[ 本帖最后由 wangzijun2006 于 2006-2-7 20:44 编辑 ]