题干
—My parents don't want me to watch TV on school nights. What should I do?
—Well, you _________ talk with them, but you must finish your homework first.
A：shall
B：could
C：can't
D：mustn't
答案(点此获取答案解析）
B
是空间不共面的四点，且满足
，
，
，则
是（ ）
）