Jackie Robinson，the first Black American who was to play baseball in t-考呗网

单选题Jackie Robinson，the first Black American who was to play baseball in the major leagues，joined the Brooklyn Dodgers in 1947．

[分析]结构应用
本句应弄清楚句子结构：两个逗号之间的部分是插入语，其余是句子主句；插入语用来解释说明主句，在此只是说明Jackie Robinson是第一个美国黑人球员，根据形容词作前置定语的词序，应用the first Black American；因此C为答案。

1By the time Bob arrives in Beijing，we have already arrived here for two days．

2The photoperiodic response of algae actually depends on the duration of darkness，but not on the response of light.

3The early railroads were connected short lines in the existing arteries of transportation: roads，turnpikes，canals，and other waterways．