题干
. You can’t imagine _______ when they received those nice Christmas presents.
A：how they were excited
B：how excited they were
C：how excited were they
D：they were excited
答案(点此获取答案解析）
B
，若
时，
＞0恒成立，则实数m的取值范围是（ ）
，则
（ ）
