A.ran | B.was running | C.had run | D.has run |
A.have been teaching | B.was teaching | C.taught | D.had taught |
A.knew | B.had known | C.have known | D.have been knowr |
A.think | B.thought | C.have thought | D.am thinking |
A.came; came | B.went; went | C.came; went | D.went; came |
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