Extra semester/year means you need to pay the tuition fee yourself(Loan or cash)no matter you tell him or not
It is between you and the university, nothing to do with MOE.
MOE's only concern is whether you fulfill the 6-year duty
我担心的是
如果读研，推迟服务期得跟MOE说，他们批准了才能读。那么如果读double degree推迟服务期的话跟MOE说了他不批准怎么办？
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