GWD-24-1 Tom Bradley was mayor of Los Angeles from 1973 to 1993, an era when the city had transformed from a collection of suburban neighborhoods to the second-largest city in the United States. - an era when the city had transformed.
- An era during which the city was transformed.
- An era that transformed it.
- During which era the city transformed.
- During which the city was transformed.
前十道错了一道。回头一查,居然很少有人错。。。真是惊天地泣鬼神。。。
本人选的是A,过去的一个时间段已经完成的动作,前半句有个was——用过去完成时,不可以么??
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