Using the information in the text, complete each sentence 14-18 with an expression from the list below. For each sentence(14

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问题     Using the information in the text, complete each sentence 14-18 with an expression from the list below.
    For each sentence(14-18), mark one letter(A-G)on the Answer Sheet.
    Do not mark any letter twice.
    A. build a sand dam
    B. fetch water
    C. maintain them
    D. drink contaminated water
    E. install the pump
    F. have a tap with safe water
    G. do other meaningful things
In villages of the developing world, the biggest problem with water schemes is how to ______.

选项

答案C

解析 见第4段第4句逗号后面的部分“the biggest problem…them move on”。
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