— ____ in this street?   — I think Mr. Black is the richest man.

          A. Whom do you think is the richest man 

          B. Who do you think is the richest man

          C. Do you think who is the richest man

          D. Do you think whom is the richest man

B                      


解析:

題中do you think為插入語,疑問詞在句中作主語。  

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