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        1. —I think trees ____________ twice a week in such hot weather.
          —Yes, I agree. Or they may die without water.

          A.must water. B.a(chǎn)re watered. 
          C.must be planted. D.must be watered. 

          D

          解析試題分析:句意:--我認為,在如此熱的天氣中,樹應(yīng)該一個星期澆兩次水。--是的,我同意。否則他們可能會因為缺水而死去。分析:考查被動語態(tài)的用法,構(gòu)成:be +done(動詞的過去分詞);本句考查情態(tài)動詞的被動語態(tài)。構(gòu)成must be +done(動詞的過去分詞)。故選 D
          考點:考查被動語態(tài)的用法。

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