Since most people now travel with cell phones, ___ calls are rarely used and have become almost obsolete.
Acollect正確答案
Bchannel
Cproceed
Dconditional
答案與詳解
collect call 為固定用法,指「對方付費電話」。在手機普及前,旅行者常依賴公共電話撥打此類電話,現已幾乎被淘汰,完全符合題意。
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