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1) have discovered
2) have been tested.
3) have had
4) have not started
5) have showed
6) have always been
2) have been tested.
3) have had
4) have not started
5) have showed
6) have always been
vocaficus:
a Present Perfect Continuous где?
2) have been testing, извините - опечаталась )
5) has showed
только во втором continuous?
да
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