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        1. —Look at the sign!
          —Oh, I see.We _______ waste water.
          A.canB.mustC.mustn’tD.needn’t
          C
          情態(tài)動(dòng)詞的用法。根據(jù)標(biāo)志可知為禁止浪費(fèi)水的標(biāo)志。表示禁止命令用must. 因此選C。
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