Advances in using genes as well as nanotechnology make it likely __humans will live in the future beyond ____has been possible in the past
A.that ,which
B.what, that
C.that ,what
D.where , what
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C解析考查复杂句：第一空填that引导的是主语从句，it是形式主语，句型是make it+adj+that…,第二空填的是what引导宾语从句，做beyond的宾语从句，在宾语从句中what做主语。选C。