问题
选择题
________very important for us to learn English because it is an international language now. [ ]
A. It is
B. It
C. That is
D. We are
答案
答案：A
搜题请搜索小程序“爱下问搜题”
________very important for us to learn English because it is an international language now. [ ]
A. It is
B. It
C. That is
D. We are
答案：A
则E(XY)=______．