The wheel is thought to be ____ invention of the fist importance in ____ human history
问题描述：
The wheel is thought to be ____ invention of the fist importance in ____ human history
A an,the B an,/ C the,the D the,/,
答
特定的哪一个用定冠词the,这里专门指the wheel
in human history在人类历史上 固定词组搭配