综合英语1Unit4单元练习习题助考1The sign X _ an unknown number.Astands forBtakes place ofCstands byDlooks up2The dog went in the water and now its wet _.Aall thereBall outCall overDall through3It is John who first _ with the good idea of going to visit the museum.Acame acrossBcame afterCcame downDcame up4I bought a new house last year, but I _ my old house yet.Adid not sellBhave not soldChad not soldDdo not
