命题“等角的补角相等”：题设是______，结论是______．
命题“等角的补角相等”：题设是两个角是等角的补角，结论是这两个角相等．
You didn't hear us come back last night. That's good. We tried ______ noisy.
A．to not be
B．not to be
C．being not
D．not being
原始主义
