Trắc nghiệm tổng hợp Tiếng anh có đáp án 2023 (Phần 9)

When did AT& T widely start their cellular phone system? A. in 2001 B. in 1977

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When did AT& T widely start their cellular phone system?

in 2001

in 1977

in 1981

37 years after their first design

Giải thích

Thông tin: In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers.

Chọn B