It was the belief Alex Haley could find his root in Africa made him decide to go to Zombia．
A. /, which
B. which, that
C. that ,which
D. that ,that
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A. /, which
B. which, that
C. that ,which
(答案→)D. that ,that
解析：考查强调句型和同位语从句。第一空that 引导同位语从句that Alex Haley could find his root in Africa解释名词belief的内容；第二空that与it was构成强调句型。句意：Alex Haley想在非洲找到自己的根的这个念头让他决定去赞比亚。故D正确。