A.it ; which | B.which ; which | C.which ; whom | D.which ; who |
A.which | B.that | C.across which | D.through which |
A.It | B.What | C.That | D.Which |
A.that"s | B.it"s | C.what"s | D.who"s |
A.many of whom | B.many of them | C.many of which | D.and many of them |
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