—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

試題分析：句意：--我認為，在如此熱的天氣中，樹應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
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