问题详情

The teacher has______catering to some students, but to retain his tenure, which effects only after a teacher has unanimously gratified his students, he offers his complaints______.
A．a hesitancy about … carelessly
B．an aptitude for … sparingly
C．a repugnance toward … tactfully
D．an enthusiasm about … zealously
E．a blitheness about … carefully请帮忙给出正确答案和分析，谢谢！