—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(rèn)為，在如此熱的天氣中，樹應(yīng)該一個(gè)星期澆兩次水。--是的，我同意。否則他們可能會(huì)因?yàn)槿彼廊ァ７治觯嚎疾楸粍?dòng)語態(tài)的用法，構(gòu)成：be +done（動(dòng)詞的過去分詞）；本句考查情態(tài)動(dòng)詞的被動(dòng)語態(tài)。構(gòu)成must be +done（動(dòng)詞的過去分詞）。故選 D
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