题目内容
Of all the inventions, what do you think is ________ invention in the 21st century．
- A.the most helpful
- B.more helpful
- C.helpful
- D.more and more helpful
A
解析：
of all“在所有的之中”，用最高级。
解析：
of all“在所有的之中”，用最高级。
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