They made working there fun even when we had to deal with customers (4) ______ got on our nerves.
They made working there fun even when we had to deal with customers (4) ______ got on our nerves.
A. with
B. why
C. where
D. who
Dùng đại từ quan hệ Who để thay thế cho danh từ trước nó (customers: khách hàng)
Chọn D