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题目内容
（哈尔滨师范大学-大学英语2）
(单选题) In their secondary schooling children got more advanced knowledge and begin to _________ on their special interests(本题2.0分)
A、 take
B、 go
C、 concentrate
D、 keep
A、 take
B、 go
C、 concentrate
D、 keep
参考答案
