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They want to know       do to help us.

A.what can they                     B.what they can

C.how they can                      D.how can they

They want to know ______do to help us.

A.what can they            B.what they can            C.how they can             D.how can they

They want to know ______do to help us.

A. what can they         B. what they can     C. how they can              D. how can they

They want to know ______do to help us.

A. what can they           B. what they can     C. how they can              D. how can they

They want to know ___ do to help us.

A. what can they　　　 B. what they can　　 C. how can they　　 D. how they can

They want to know _____ do to help us.

A. what can they B. what they can　　 C. how they can　 D. how can they

 They want to know ________ do to help us.

         A．what can they          B．how they can      C．what they can      D．how can they

 They want to know ________ do to help us.

         A．what can they          B．how they can      C．what they can      D．how can they

They want to know        do to help us.

       A．what can they          B．what they can

       C．how they can           D．how can they