Go and get your coat. It's you left it.
A:there
B:where
C:there where
D:where there
—Is Tom still in New York or already back at home? —I'm not sure _________. I'll call to make sure.
如图,已知AB//CD,∠A=80°,则∠1的度数是( )
推理是化学学习中常用的思维方法。下列推理正确的是