体育锻炼的原则应包括明确目的，自觉锻炼及野外自然运动和民族体育运动等。
参考答案：错
— I called you yesterday evening, but there was no answer.
— Oh, I am sorry. I _____ dinner at my friend's home. [ ]
A: have
B: had
C: was having
D: have had
按照国际金融市场的通常做法，采取配售方式，承销商可以将所承销的股份以议购方式向特定的投资者配售。（）
