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is reading reads read has read
shall be should have been must be might have been
Nick and Mary’s Nick’s and Mary’s Nick’s and Mary Nick and Mary
What clean (干净的) What a clean How’s clean How clean
What happens What is happened What is happening What was happening
seating; writing seated; wrote sitting; wrote seated; writing
talking; but was talking; though talks; though talked; however
left had left was leaving was left
talking, but was talking, though talk, though Talked, however
where is Mary’s schoolbag where Mary is whose schoolbag is it whose schoolbag it is
where she is where is she who is she who she is
B.C.D.四个选项中，选出可以填入空白处的最佳答案。 Look, Mary _______ a newspaper in the classroom. A. . is reading reads read has read
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