Reading ___the lines, we can get the message they are worried about their son.A.between; thatB.behind ; thatC.along; whatD.among; which
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A解析考查固定词组与同位语从句。Read between the lines领悟言外之意; that they are worried about their son. 是同位语从句解释message的内容。That只起引导作用，不充当任何成分。