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

試題分析：英語中數(shù)詞表示概數(shù)時，后面加s，和介詞of搭配使用。用原形時表示具體數(shù)字和數(shù)詞搭配使用。句意：喔，這些發(fā)明太神奇了。——他們是多年以前發(fā)明的。結合語境可知下文表示概數(shù)，故選D。
點評：英語中關于hundred、thousand和million三個數(shù)詞的用法只需要記住一個原則就行。即；前有數(shù)詞則不加s，加s必加of。
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