___ most of the earth’s surface is covered by water, fresh water is very rare a
题型：不详难度：来源：
| ___ most of the earth’s surface is covered by water, fresh water is very rare and precious. |
答案
| D |
解析
| 本道题考查让步状语从句。一定要看懂：虽然地球表面覆盖着水，但是纯净水仍然很稀有和珍贵。选择D. |
举一反三
1. — Have you known each other for long?
— Not very long, ____ we started to work in the company.| A．after | B．before | C．when | D． since |
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_____I know she"s not perfect, I do like her.| A．While | B．When | C．Because | D．Once |
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We’d better set off，or it will be dark we know it.| A．before | B．after | C．when | D．until |
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We know our friends by their defects ______ by their merits.| A．than | B．in the place of | C．rather than | D．instead of |
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This is an ideal site for a university ______ it is far from The downtown area.| A．provided that | B．now that | C．so that | D．in that |
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