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A recent study has found amoxicillin, long a standard treatment for ear infections, as being about as effective as newer, more expensive antibiotics and causing fewer side effects.

(A) amoxicillin, long a standard treatment for ear infections, as being about as effective as newer, more expensive antibiotics and causing

(B) amoxicillin, long a standard treatment for ear infections, to be about as effective compared to newer, more expensive antibiotics and with

(C) amoxicillin, long a standard treatment for ear infections, to be about as effective as newer, more expensive antibiotics and that it causes

(D) that amoxicillin, long a standard treatment for ear infections, is about as effective as newer, more expensive antibiotics and causes

(E) that amoxicillin, long a standard treatment for ear infections, is about as effective compared to newer, more expensive antibiotics and with

两个以上的形容词修饰名词时，如果两个形容词是同语义类别的，那么中间要加and或者逗号，如果是不同语义类别的，中间不用加and和逗号。

newer和more expensive是属于同一语义类别，都是从表象方面来形容antibiotics。

举个白勇上的例子(名词可能记错了，但是形容词没错...)：

official financial assistance.

concrete and glass factory.

谢谢以上两位的解答～！！