Tom's brother, _____ lives in New York, is an engineer.
A: who
B: whom
C: that
D: which
                    A: who
B: whom
C: that
D: which
举一反三
- Jack, ________brother teaches physics, is an engineer. A: his B: of whose C: whose D: who’s
 - _______ idea is it?It's Tom's idea. A: Whose B: Whom C: Who
 - Who lives in New York City? A: Tara and Mike B: Mike and Takeshi C: Tara and Takeshi
 - It was Tom ______ opened the door just now. A: who B: which C: whom D: whose
 - Who found Tom’s youngest brother A: [A] The woman. B: A policeman. C: Tom.
 
