初中英语宾语从句单选题

She asked the secretary        she could come or not.

A．if

B．that

C．what

D．whether

–---I wonder __________.   –--Zebras.

A．what do they call these animals	B．how they call these animals
C．what they call these animals	D．how do they call these animals

— Do you know about the Japanese nuclear crisis(核危机)?
— Yes. I know           .

A．how are they dealing with it	B．what it has caused
C．how terrible was it	D．how long will it last