Find the one mistake (A, B, C or D) in the sentence below and then correct it:

(A) Unless anyone rings (B) for me, (C) please tell them (D) I'll be back in the office at 4 o'clock.

Suy nghĩ và trả lời câu hỏi trước khi xem đáp án

ATNETWORK
ADMICRO
YOMEDIA
ZUNIA9