一般过去时叙述人物经历 — 英语选择题
题目
Thomas Edison devoted his life to invention. Before he ___ (become) famous for the light bulb, he ___ (fail) more than a thousand times, but he never gave up. Which of the following fills the blanks correctly?
A. became; failed
B. becomes; fails
C. became; has failed
D. was becoming; was failing