She must have burnt her midnight oil for the whole week,______she got very good marks.A.for B.because C.since D.as

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Shemusthaveburnthermidnightoilforthewholeweek,______shegotverygoodmarks.A.forB.becauseC.sinceD.asShe

She must have burnt her midnight oil for the whole week,______she got very good marks.A.for B.because C.since D.as
She must have burnt her midnight oil for the whole week,______she got very good marks.
A.for B.because C.since D.as

She must have burnt her midnight oil for the whole week,______she got very good marks.A.for B.because C.since D.as
A
for 一般用在句中,表示补充说明的原因.
because 一般回答why提出的问题,表示直接原因.
since 表示显而易见的原因,一般位于句首,翻译为“既然”.
as是从属连词,说明一般的因果关系,它引导的从句通常放在句首,有时也可放在句末.
意思:我们都相信,她挑灯夜战了整整一个星期,因为她每科分数都很高.