the old man’s sons wanted to know was the gold had been hidden.
A. What; where
B. That; what
C. What; that
D. That; which
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(答案→)A. What; where
B. That; what
C. What; that
D. That; which
解析：考查名词性从句。What引导主语从句what the old man’s sons wanted to know在句中做know的宾语。Where引导表语从句where the gold had been hidden指埋黄金的地方。句意：老人的儿子想知道的是黄金被埋的地方。故A正确。