37. While some academicians believe that business ethics should be integrated into every business course, others say that students will take ethics seriously only if it would be taught as a separately required course.
A. only if it would be taught as a separately required course
B. only if it is taught as a separate, required course
C. if it is taught only as a course required separately
D. if it was taught only as a separate and required course
E. if it would only be taught as a required course, separately
 
1.句子逻辑意思（一级排除C，D, E )
Only if 不能变成 If + .. + Only  强调的意思不一样
only in C, D, and E should immediately precede the entire clause that it is meant to modify.
Only if只有才

2. 虚拟语气(二级排除A )
in sentences expressing a conditional result (x will happen if y happens), the verb of the main clause should be in the future tense and the verb of the if clause should be in the present indicative. x will happen if y happens  条件状语从句的时态一定要是主句的一级过去式。 即 一般将来时 if 一般现在时 ； 一般现在时 if 一般过去式；

3.  修饰：
Also, the intended meaning is distorted when the adverb separately is used to modify required, as in A and C, or taught, as in E;  B correctly uses the adjective separate to modify course.
体会所要表达的原始的意思（separately的修饰错误。）
adv. + adj.+ n . adv. 修饰 adj. 表示 adj. 发生的状态； adj. , adj. + n.  adj. 修饰 n.  ==》 根据逻辑意思决定 是那种形式。