水绵、蓝藻、黑藻全部[ ]

A．是真核生物

B．含有叶绿体

C．是自养生物

D．能有丝分裂

    _ the Smiths will come or not is        she is worrying about.[ ]

A. What; that  

B. Whether; what  

C. If; that  

D. How; which