阿拉伯和印第安人分别属于[ ]

A．白种人和黄种人

B．黄种人、黑种人

C．黑种人、白种人

D．白种人、黑种人

—I don't know if Mr Li________to the party this evening.    

—I think he will come if he _______ free.       [ ]

A. will come; is            

B. will come ;  will be      

C. comes ;  is                

D. comes; will be