()10.—Couldyoujoinusthisafternoon?—SorryI.Itakecareofmylittlesisterbecausemymotherisout.A.can't;mayB.mustn't;havetoC.can't;havetoD.mustn't;may
() 10. — Could you join us this afternoon?
—Sorry I . I take care of my little sister because my mother is out.
A. can't; may B. mustn't; have to C. can't; have to D. mustn't; may
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