A.if | B.where | C.whether | D.That |
A.what | B.which | C.that | D.Where |
A.When | B.As | C.While | D.Once |
A.How about | B.What if | C.If only | D.Even if |
A.where; that | B.which; when | C.when; which | D.that; that |
A.Although | B.While | C.As | D.Unless |
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