It's important for us to employ a word or a phrase to the ________ in language studies.A.situationB.expressionC.conditionD.translation
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A解析situation指“处境，境遇；情境”，如in a dangerous situation（在危险环境中）；condition指“条件，（人、物等）本身状况”，in a dangerous condition（处境危险），本句指词或短语符合上下文语言环境，故选A．