问题
选择题
She is my best teacher ______ help I have made great progress. [ ]
A. with whom
B. whose
C. which
D. with whose
答案
答案：D
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She is my best teacher ______ help I have made great progress. [ ]
A. with whom
B. whose
C. which
D. with whose
答案：D
将方程y"cosx-2y’sinx+3ycosx=ex化简，并求出原方程的通解．