undertake that ...

　　承诺……

　　undertook the responsibility of doing sth. 承担做某事的责任

　　【即时巩固】单项选择题

　　①—John, would you lend me some money?

　　—Unless you ________ to pay the money back within six months.

　　A. understand

　　B. undertake

　　C. underplay

　　D. underline

　　②________ the situation, Charles Yerkes undertook _______ the system in 1902 by obtaining ownership of many different lines.

　　A. Seeing, improving

　　B. Seen , improved

　　C. To see, to improve

　　D. Having seen, to improve

　　考点-4. enlarge

　　【教材原句】After World War Ⅱ ended in 1945，more people travelled on the underground, so the system was enlarged and more lines were added including the Victoria Line，which was linked with other lines at almost every station.(P51)1945年第二次世界大战结束后，更多的人乘坐地铁，于是又增建了更多的地铁线路，其中包括维多利亚线，它所有的站几乎都和其他线相连。

　　【例句研读】根据英语句子完成英语句子

　　①You must do more reading as it will enlarge your vocabulary.

　　你必须多读，因为阅读

　　。

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