在职攻硕英语考试

【单选题】 (There) is an unresolved controversy as to (whom) (is) the real author of the Elizabethan plays (commonly) credited to William Shakespeare.
A．There
B．whom
C．is
D．commonly

网考网参考答案：B
网考网解析：
将whom改为who。这是介词短语as to的宾语从句，关连词who是从句的主语，故不能用who的宾格形式。 查看试题解析出处>>