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My sister ________ very hard and she is now ________ at home.
A.study;studyingB.studies;studyC.studies;studyingD.isstudying;studying...
A. study; studying
B. studies; study
C. studies; studying
D. is studying; studying 展开
B. studies; study
C. studies; studying
D. is studying; studying 展开
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