--- I haven’t seen Mary recently. And you?--- Me neither. I’m afraid she _________ to her experiment for too long a time.A.is devotingB.was devotedC.has been devotingD.has been devoted
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D解析考查时态。固定词组be devoted to致力于。根据上下文可知我最近没有空间Mary,是因为她致力于做实验。使用完成时表示过去发生的事情对现在的影响。