Bộ 20 đề kiểm tra Tiếng Anh thi vào 10 có đáp án - Đề 13

system that is understood by both sender and (24)_______, and an agreed convention about signaling the beginning

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system that is understood by both sender and (24)_______, and an agreed convention about signaling the beginning and end of the message.

Announcer

Receiver

Messenger

Transmitter

Giải thích

Chọn đáp án B