世界上最深的淡水湖是                                       （   ）

A．贝加尔湖

B．里海

C．黑海

D．苏比利尔湖

_______Lisa _______Lucy may go with you because one of them must stay at home to take care of the dog.

A．Not only ---but also

B．Neither---nor

C．Both---and

D．Either----or