问题补充:
单选题CathyistakingnotesofthegrammaticalrulesinclassatSunshineSchool,wheresheEnglishnow.A.studiesB.studiedC.is studyingD.was studying
答案:
C解析考查动词时态。根据时间状语now和主句的时态可知用现在进行时,选C。
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