SAT 句子提升的一道题 求教

问题描述:

SAT 句子提升的一道题 求教
By painting them this afternoon,the wall would be completely dry by tomorrow evening.
改by painting them这一句.我选的是After painting them,答案是Were they to be painted.
为什么这么选?我选的为什么不对?也请帮我分析一下正确答案的结构.

答案是if虚拟条件句的省略,相当于If they were to be painted, the wall would be completely dry by tomorrow evening. 表示跟将来事实相反.if虚拟条件从句中如出现were,had,或者should,可提前至主语之前,省略if.
你选的after painting them,是省略了主语和be动词,这种省略的前提是从句和主句的主语是一致的,所以其完整形式应为:After the wall was painting them,这样可以看出句意不顺.