A.until, that | B.not until, when | C.until, when | D.not until, that |
A.which | B.whose | C.who | D.that |
A.whom | B.whose writers | C.who | D.writers of which |
A.when | B.if | C.unless | D.once |
A.where | B.what | C.how | D.that |
A.and most of which | B.some of which |
C.some of them | D.most of these |
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