有一读者问：下一句中有何错误？
As she pivoted to leave the stage, the mayor surprised her by placing a baton in her hand and announced that she would lead the band “The Stars and Stripes Forever”.
此句错在用了 announced。从句子的本义来看，介词 by 有两个宾语，一是 placing, 另一个是announcing。 换言之，placing 与announcing 两者应是一种并列关系。因此，announced 应改作 announcing。
