The phrase " tried it out" refers to __________ . A. made effort to sell the cell-phone138/161The phrase " tried it out" refers to __________ .made effort to sell the cell-phonereported on AT& Ttested the cell-phone system introduced the cell-phone systemGiải thíchtried it out = thử nghiệm hệ thống điện thoại di động Chọn C