A.who; who | B.that; which | C.who; that | D.who; which |
A.If | B.While | C.Because | D.As |
A.when | B.where | C.how | D.what |
A.which | B.that | C.why | D.when |
A.Unless | B.Once | C.Whether | D.Although |
A.as; him | B.that; / | C.as; / | D.whom; him |
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