The twins were born ________ the morning of July 2, 1990.A.inB.onC.byD.at
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B解析在表示时间时，除固定词组外，如in the morning，at noon，at night，last week/year等，in用在月，季，年前，in 1948，in winter，in December，in October，1949. on用在“天”前，on Sunday（s），on October，1．On Sinday morning. at用在“几点钟”前，at six o'clock, at seven thirty．by表示到……为止，不迟于，by yesterday，by the end of last month，by then