________ more difficult for grow-ups to learn a foreign language.
A.It seems that it isB.That seems to beC.They seem to beD.It seems to be在线课程D
导解：seem的主语可以是名词或代词，也可以是引导词it．在it seems…that句型中，that从句中的主语与主句中it不能重复．
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