undertook解释为：动词undertake的过去式
undertook详细解释
动词undertake的过去式
例句与用法：
He undertook to defend this attitude.
他开始为这一态度辩护。
She undertook to discharge all the responsibilities of a Minister.
她承担了做部长的所有责任。
I undertook to indemnify them for expenses incurred on my behalf.
我负责偿还他们为我而用的全部花费。
He undertook to finish the job by Friday.
他答应星期五之前完成这项工作。
详细释义：
(undertake的过去式)
