A.before | B.after | C.until | D.since |
A.whose | B.which | C.of which | D.what |
A.at which | B.at where | C.the place where | D.where |
A.when,toforget | B.which, to be forgotten |
C.that, to forget | D./,to be forgotten |
A.which cover | B.the cover of which | C.its cover | D.the cover of whose |
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