A.works | B.worked | C.had worked | D.has worked |
A.happened to; that | B.occurred to; it |
C.happened to; which | D.occurred to; which |
A.should; who | B.must; whom | C.can; that | D.will; who |
A.isn’t known | B.aren’t known | C.has not known | D.have not been known |
A.is washed | B.is washing | C.will be washed | D.washes |
A.had broken | B.broke | C.has broken | D.would break |
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