問題詳情
【題組】9. Which of the following is true?
(A) It is cheap and easy to build a well.
(B) Ryan learned the news about African children online.
(C) We can not help others because weare too young.
(D) Ryan helped drill over 800 wells in 16 countries.
參考答案
答案：D
難度：計算中-1
書單：沒有書單，新增
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