單項選擇。—Inmyopinion，notallinventionswereinventedby

問題詳情：

單項選擇。

—In my opinion，not all inventions were invented by ________ accident.

—Well，you do seem to have ________ nting needs much time and hard work.

A．an；a  B．an；the  C．/；a  D．/；the

【回答】

C

知識點：冠詞

題型：選擇題