A.when;who | B.that;which | C.on which;that | D.when;which |
A.that | B.which | C.who | D.as |
A.which;what | B.throughwhich;what | C.throughthat;what | D.what;that |
A.when | B.which | C.where | D.That |
A.for, on | B.on, in | C.of, down | D.to, on |
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