When customers have a complaint, employees have been instructed ------- the supervisor on duty.

Question 1

A. to inform

Answer

A. to inform

Question 2

B. to have informed

Answer

B. to have informed

Question 3

D. to be informed

Answer

D. to be informed

Question 4

C. to informing

Answer

C. to informing

Câu hỏi: When customers have a complaint, employees have been instructed ------- the supervisor on duty.