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题目内容
（广东开放大学学位外语（本，23春））
Christopher Columbus ______America while Edison ______ the light bulb.
选择一项：
a. discovered; discovered
b. invented; discovered
c. invented; invented
d. discovered; invented
选择一项：
a. discovered; discovered
b. invented; discovered
c. invented; invented
d. discovered; invented
参考答案
