So mysteriously ______ missing that many puzzles wait to be solved.
A．did Flight MH370 goB．Flight MH370 went
C．does Flight MH370 goD．had Flight MH370 gone
A

試題分析：句意：MH370航班消失的是如此神秘以至于許多困惑有待解決。本題屬于so+adj/adv.... that副詞提前的倒裝句中的一種特殊句式，排除B。因為Flight MH370消失發(fā)生在過去，故用一般過去時。故選A。
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