A logarithm is( ) in algebra as an exponent a known what b know what it is c what is konwd.what it is know 选什么,为什么啊,

A logarithm is( ) in algebra as an exponent a known what b know what it is c what is konwd.what it is know 选什么,为什么啊,
A logarithm is( ) in algebra as an exponent a known what b know what it is c what is konw
d.what it is know 选什么,为什么啊,

A logarithm is( ) in algebra as an exponent a known what b know what it is c what is konwd.what it is know 选什么,为什么啊,
要么你把 C 的内容打错了,要么必须创造一个选项 e what is known.
把问句当子句的模式.
问句：What is known in algebra as an exponent?
答案：A logarithm.
整合成一个完整句子就是：A logarithm is what is known in algebra as an exponent.
从英语的角度来说,这个问题出的很糟糕,这里的词组是 be known as,他在中间插上 in algebra,结果考的时候把 be known as 强制拆开了.
当你自己必须知道,这个词组是 be known as,而不是 be known.
be = is,are,...etc

什么啊？写清楚点咯