To ___ your level of competency in speaking a foreign language, you need to practice it every day.
Adrop
Bviolate
Cassign
Dmaintain正確答案
答案與詳解
maintain 意為「維持、保持」,maintain the level of competency(維持能力水準)為標準搭配,符合「每天練習」的語境。
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