A. As B. Because C. Until D. So
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() A.asB.becauseC.soD.but
【C15】A.andB.becauseC.butD.so
【C13】A.asB.becauseC.thoughD.that
【C13】A.alsoB.becauseC.asD.so
They did the experiment______ their chemistry teacher had instructed.A.asB.thoughC.untilD.
【C3】A.ButB.BecauseC.AndD.So