A.whose | B.who | C.where | D.which |
A.where | B.that | C.when | D.which |
A.while | B.until | C.and | D.unless |
A.if | B.once | C.as | D.when |
A.which,it | B.that,it | C.which,that | D.that,that |
A.As if | B.in case | C.even though | D.as long as |
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