Though modern munication technology is so developed, I received letters from my parents ________.A.at a timeB.at one timeC.at timesD.at any time
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C解析解析:at a time意为“一次”;at one time意为“曾经,在过去的某个时候”;at times意为“有时”;at any time意为“在任何时候”。本句意为:虽然现代通讯技术这么发达,但我还是有时收到我父母的来信。因此C为正确