15．---Inventors have changed the way we live．
---So they are famous for the great things they___．（　�。�
A．doB．didC．are doingD．had done

分析 --發(fā)明家們改變了我們的生活方式．
--因此他們因他們的發(fā)明而聞名．

解答 答案：B．
本題考查了實意動詞的過去式．根據(jù)So they are famous for the great things they…，可知這里the great things they…應(yīng)該說的是他們發(fā)明的東西，從語境看應(yīng)該是發(fā)生在過去，所以句子的時態(tài)應(yīng)該是一般過去時，這里用did來代指發(fā)明家們所做的事情．故選B．

點評 題首先理解句意，然后根據(jù)所給選項的意思，作出正確判斷即可．

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