If students only have a(n) grasp of this complicated mathematical concept, it is difficult for them to learn another one.
Atenuous正確答案
Bgratuitous
Csuspicious
Denvious
答案與詳解
tenuous 意為「薄弱的、微弱的、不牢固的」。tenuous grasp 是固定搭配,指「掌握不牢」,正好對應後句「難以學下一個概念」的邏輯。
