A.where | B.when | C.why | D.how |
A.What; is due to | B.Which; is going to |
C.That; is to | D.What; is about to |
A.What for | B.So what | C.How’s that | D.How come |
A.It; if | B.This; as long as | C.There; because | D.Here; while |
A.until | B.while | C.as | D.before |
A.whether | B.since | C.that | D.if |
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