Answer:D
Explanation:
He was very rude TO customers. Recently they have complained to us ABOUT his behavior a lot. (Makes most sense)
The correct answers for the fill-ups are given in option (D): "to/about" The reasons are given below, kindly follow them closely to understand.
To designate the thing or person that experiences or receives the verb's object is used with verbs like give, hand, transmit, and write.
To is a preposition and a little word that can be used to express a variety of ideas.
It can be used to denote a destination, a path to go, as well as a point of arrival. When you say you're going to class tomorrow, you use it in that manner. Here they indicate to the customers.
And, the use of about is to explain who or what something is about or has to do with. Here, this is about the behavior of the subject.
Therefore, "He was very rude to customers. Recently they have complained to us about his behavior a lot." Hence, option (D) is the correct answer.
Check out the link below to learn more about prepositions;
https://brainly.com/question/4956879
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