这个选择题，选哪个？？
23.Becausecellphonesaresowidely(A)usedtoday,manymovietheaterspost(B)signswarning(C)th...
23. Because cell phones are so widely(A) used today, many movie theaters post(B) signs warning(C) that it is(D) not permitted during the movie. No error(E)
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