Complete the following statements with proper words or expressions according to the course book.For beginners and elementary learners, a ( ) dictionary is essential as they do not know enough of the target language to understand fully a monolingual dictionary.
【正确答案】：BILINGUAL
【题目解析】：对于初学者和初级学习者来说，双语词典是必不可少的，因为他们不完全了解目标语言以完全理解单语词典。
