题干
I really regret telling you about Tom's choice for I thought you ____ (keep) it a secret.
答案(点此获取答案解析）
would keep
I really regret telling you about Tom's choice for I thought you ____ (keep) it a secret.
B. 
C. 
B. 
C. 
B. 
C. 
B. 
C. 
B. 
C. 
在
)，求切线L的方程。