Many a student ______ the importance of learning a foreign langu

Many a student ______ the importance of learning a foreign language.
A、have realized
B、has realize
C、have been realized
D、has been realized
【正确答案】：B
【题目解析】：many a 虽然表达的是复数概念却要加动词单数形式, 因此have要用三单形式 has.
student 和realize 是主动关系，因此不使用被动语态。