题干
Tom wants to be a singer and he singing lessons to do it.
A：took
B：has taken
C：is taking
D：was taking
答案(点此获取答案解析）
C
Tom wants to be a singer and he singing lessons to do it.
A：took
B：has taken
C：is taking
D：was taking
HCl+HClO。加入少量下列物质能使c(HClO)增大
