she must have burnt her midnight oil for the whole week,_____she got very good marks in the exams.A.for B.because C.since D.as 需说明理由,分析各个选项

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she must have burnt her midnight oil for the whole week,_____she got very good marks in the exams.A.for B.because C.since D.as 需说明理由,分析各个选项
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she must have burnt her midnight oil for the whole week,_____she got very good marks in the exams.A.for B.because C.since D.as 需说明理由,分析各个选项
she must have burnt her midnight oil for the whole week,_____she got very good marks in the exams.
A.for B.because C.since D.as 需说明理由,分析各个选项

she must have burnt her midnight oil for the whole week,_____she got very good marks in the exams.A.for B.because C.since D.as 需说明理由,分析各个选项
B since 和as应该用在句首,for跟名词