---What did Lily tell you just now?

----She asked me _______ others her secret.

A．to tell not

B．not to tell

C．don’t tell

D．not tell

我国现行的《商标法》规定，注册商标的有效期为（）年，保护期满后，只要企业及时续展，就可再获保护，且续展次数不限。

A.5

B.10

C.15

D.20