Traditionally, the young are used to doing what they are told,but then their ideas would in their brain and not heard.
A. be locked
B. be rooting
C. be fastened
D. be tying
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(答案→)A. be locked
B. be rooting
C. be fastened
D. be tying
解析：be locked in“留在……中”；B选项应为be rooted in；C选项应为be fastened to。