7.1 developed very slowly and it took nearly two hundred years        as an analytical machine by Charles Babbage. (build)

我發(fā)展得非常緩慢，差不多過了 200年我才被查爾斯•巴貝奇制造成一臺(tái)分析機(jī)。

7. before I was built考查before引導(dǎo)的狀語(yǔ)從句。該句型是固定句型，結(jié)構(gòu)為：it takes / took+時(shí)間段+before從句，意為：要過多久才"…-;其否定句為：it doesn't / didn't take+時(shí)間段+before 從句，意為：沒過多久就……。

題目來(lái)源：高考丟分題英語(yǔ) > Unit 3 Computers

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