—Could you please tell me _____________?

--“Rome wasn’t built in a day”. You should try to give it enough chances to become strong.

A．why I should do to have a good memory

B．what I can do to have a good memory

C．how can I do to have a good memory

D．what can I do to have a good memory

主要泵房至少有（）出口，并且泵房和水仓的连接通道，应设置可靠的控制闸门。

A.2个

B.3个

C.4个