All her attempts to open the box were ___________; it was sealed with a highly complex lock.
Afutile正確答案
Brational
Csymbolic
Dtheoretical
答案與詳解
futile 意為「徒勞無功的、無效的」。句意為「她所有打開盒子的嘗試都是徒勞的;它被一個極複雜的鎖封住」,完全符合語境。
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