Please send the information to this address.I look forward to hearing from you soon."

问题描述:

Please send the information to this address.I look forward to hearing from you soon."
我正在学习英语,感觉这句话"look forward to hearing from you soon"中“to"应该是多余的,但又不能肯定,请哪位朋友给予确认一下,

为什么是多余的呢?look forward to doing sth是个固定搭配,所以不用去掉to