—Who’s that boy reading in the study ? Is it David?—It __________ be David. I saw him go home j
—Who’sthatboyreadinginthestudy?IsitDavid?—It__________beDavid.Isawhimgohomejustnow.A....
—Who’s that boy reading in the study ? Is it David?—It __________ be David. I saw him go home just now. A.must B.can’t C.may D.shouldn’t
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