78. 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
Grammatical construction + Verb form
Conditional constructions require specific verb tenses．For a present condition, like this debate between academicians，the subordinate clause introduced by if uses the present indicative，and the main clause uses the future tense：if，x happens, then y will happen，The order of the two clauses may be reversed，as is the case here：y will happen only if x happens first．They clause is students will take…，so the x clause must be only if it is taught…Logically, the course is to be both separate and required, so the two adjectives should equally modify the noun and thus be separated by a comma：separate, required course．
A The verb tense in the if clause is incorrect；the adverb separately should be the adjective separate．
B Correct．This sentence has the correct verb tense，and the two adjectives equally modify the noun．
C Only must precede if; a course required separately is unclear．
D Incorrect verb tense in the if clause；only must precede if
E Incorrect verb tense in the if clause；only must precede诉the adverb separately should be the adjective separate and should precede the noun．
The correct answer is B．
请问红色字体部分，从逻辑角度该怎么理解？
我倒觉得separately required非常顺口，也很说的通。
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