题目内容

---Wow! These inventions are amazing．
—They were all invented _______years ago.
A．hundredB．hundredsC．hundred of D．hundreds of
D

试题分析：英语中数词表示概数时，后面加s，和介词of搭配使用。用原形时表示具体数字和数词搭配使用。句意：喔，这些发明太神奇了。——他们是多年以前发明的。结合语境可知下文表示概数，故选D。
点评：英语中关于hundred、thousand和million三个数词的用法只需要记住一个原则就行。即；前有数词则不加s，加s必加of。
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