OG语法两道求指教!!!

jkzlg

Verbal 2nd edition
73题C项答案解释说appears that it has 是incorrect verb form所以错, 可是我查了字典有这种用法. 是否这种用法比起appears to have过于累赘呢?
74题
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
答案B
我选错了D因为我以为是if从句内容是一种假设,所以使用虚拟, 其次我不选B因为seperate和required之间没有and连接. 答案解释说seperate和required是equally modify the noun "course".所以要加逗号. 那和用and有什么区别呢?

petmartina

UP

消失的镜

简洁顺序：动词>形容词>抽象名词>分词动名词>从句
所以appear to do 更好

第二题D选项颠倒了句子顺序，使强调的内容发生变化，所以错误。
ps：两个并列词可以不用and连接~

jkzlg

那什么情况下一定要有and呢? 可否分别举个例子呢?

cadylql

xdf 老师给的解释是，if后面是条件状语从句，

而‘时间状语从句，条件状语从句，用一般现在是表将来’

所以would 错。

ssyy23

74题的C怎么错了