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Because of too many differences between the two sides,  a lot of questions are still left ________.
A in the air      B on the air         C by the air      D through the air
A
本題考查詞組搭配。In the air 意思是“（計(jì)劃等）未決定的”；on the air 意思是“在廣播中”；C、D不正確。根據(jù)句意“很多問題還未解決”，故A正確。
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