15000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 13)

They made working there fun even when we had to deal with customers (26) ______ got on our nerves.

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They made working there fun even when we had to deal with customers (26) ______ got on our nerves.

which

why

when

who

Giải thích

Đáp án D