If they ______ what I was saying, they’d know what I was talking aboutA.took the trouble to listen toB.had trouble listening toC.take the trouble to listen toD.have trouble listening to
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A解析考查与现在相反的虚拟语气，从句用：if + 主语+ 过去式/were,主句用：would/could/might do,句意：如果他们努力听我所说的话，他们会明白我谈论的是什么。短语：take the trouble to do 不辞辛苦做某事，非常努力做某事。所以选A。