The students found it easy to what the experienced teacher had taught.A. take inB. take of

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(答案→)A. take in
B. take off
C. take on
D. take back
解析：词义辨析。take in吸收，理解；take off脱掉，飞机起飞；take on承担，呈现；take back收回，取回。句意：学生们发现这位有经验的老师所教的知识很容易理解掌握。所以选A。