Present Perfect Practice Quizzes
experience
http://www.ecenglish.com/learnenglish/lessons/present-perfect-quiz
mix
http://a4esl.org/q/f/z/zz29bms.htm
for and since
http://a4esl.org/q/h/lb/forsince.html
http://www.eclecticenglish.com/grammar/PresentPerfect1D.html
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