https://www.ego4u.com/en/cram-up/grammar/past-perfect-simple/exercises
http://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_simple_past.htm
http://www.englishpage.com/verbpage/verbs5.htm
https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/tests?test2
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