A.both of they | B.both of whom | C.both of them | D.whom of both |
A.that | B.what | C.why | D.for which |
A.of it | B.which | C.whose | D.of which |
A.whom | B.which | C.that | D.whose |
A.by which | B.on which | C.in which | D.which |
A.in which | B.which | C.through which | D.by which |
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