(单选题) In their secondary schooling children got more advanced knowledge and begin to _________ on their special interests(本题3.0分) A、 take B、 go C、 concentrate D、 keep

(单选题) In their secondary schooling children got more advanced knowledge and begin to _________ on their special interests(本题3.0分)
A、 take
B、 go
C、 concentrate
D、 keep

出自：大连工业大学-大学英语2

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