摘要:6.[2010·河北唐山市二模]Tell John not to leave the house unless he that the lights . A.will make sure.turn off B.makes sure.are turned off C.will make sure.will turn off D.makes sure.will be turned off 6B考查动词时态及短语的含义.此处unless引导的条件状语从句用一般现在时代替一般将来时.根据句意the lights应已经被关掉.所以选B.

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