【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(xué)練習(xí)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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