"please fill () the blanks with proper words."此句中括号内应填什么介词?

问题描述:

"please fill () the blanks with proper words."此句中括号内应填什么介词?
please fill ( ) the blanks with proper words.此句中括号内应填什么介词?详细说说相关知识点.

fill in 为固定配搭,意为“填满” 希望您满意.