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Exercise "Modal verbs Can & Must", created by anonyme (a free exercise to learn English):
Results of the 6 626 people who have taken this test:
Average mark: 64 / 100 Share
Latest member with a 100/100 (perfect mark): ploplo / SWITZERLAND, on Tuesday 25 September - 18:31:
"!! Thanks a lot for the exercise !!"
They got a perfect mark
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