题干
Our teachers were very happy because ______ failed the exam.
A：somebody
B：anybody
C：nobody
答案(点此获取答案解析）
C
Our teachers were very happy because ______ failed the exam.
A：somebody
B：anybody
C：nobody
。则该DNA分子连续复制两次共需游离的胸腺嘧啶脱氧核苷酸的数目是（ ）