Although the educational systems have beena lot, the loads of the students are still very

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(答案→)A. transformed
B. transported
C. transferred
D. transmitted
解析：词义辨析。Transformed改革；transported运输，运送；transferred转让，转移；transmitted传送，传输。句意：尽管教育体系已改革了很多，学生的负担仍然很重。所以选A。