A.who | B.when | C.on which | D.which |
A.when;which | B.that;which | C.which;that | D.when;that |
A.when | B.that | C.how | D.where |
A.that | B.what | C.which | D.as |
A./ | B.for which | C.why | D.all the above |
A.where | B.on which | C.under which | D.in which |
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