Mylittlesonhasbeenlateforschoolt

发布时间:2020-07-27 11:01:19

My little son has been late for school three times ________ the morning of last Friday.A.inB.sinceC.onD.by

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B解析此题为现在完成时态,而the morning of last Friday为时间点,故前面应该用since,千万不能选A和C。
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