Theyhavebeendoingtheirhomework

发布时间：2020-07-28 04:43:44

They have been doing their homework ________ they came from the school．A.asB.sinceC.whileD.because

网友回答

B解析since是“自从”的意思，句意是“自从他们从学校回来后就一直在做作业”。
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