问题: 模拟卷6-26
Every possible means _______ tried out to attract more customers, but I think the only means ____ to improve our service.
A. have been, are B. are, is
C. is, has been D. has been, is
请详细写出解题的过程和思路。
解答:
D
MEANS 是名詞 方式，方法的意思。。EVERY..和 THE ONLY指明了是單數。。每一個可能的辦法都試過了，要用被動的完成時態。。
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