需要变更工作班成员时，必须经过（）同意。
A.工作负责人
B.工作许可人
C.工作票签发人
D.自行认可
参考答案：A
Although I try to talk to my classmates, I still find _______ hard to make good friends with them.
A. them B. they C. it D its
和平与发展的关系如何？
