【題目】The letter “X” often represents an ________ (know) number in some Math exercises.

【答案】unknown

【解析】

句意：在一些數(shù)學練習中，字母“X”通常表示一個未知的數(shù)字。

根據(jù)“The letter “X” often represents”可知，這里是說字母“X”表示一個未知數(shù)字。這里是形容詞作定語，所給單詞know，動詞，知道，這里用形容詞unknown，不知道的，未知的。故答案為unknown。

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