( )carefui when you cross the road.A Be do B Do you be C Do be D Do

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()carefuiwhenyoucrosstheroad.ABedoBDoyoubeCDobeDDo()carefuiwhenyoucrosstheroad.ABedoBDoyoubeCDobeDDo

( )carefui when you cross the road.A Be do B Do you be C Do be D Do
( )carefui when you cross the road.A Be do B Do you be C Do be D Do

( )carefui when you cross the road.A Be do B Do you be C Do be D Do
C Do Be.
在肯定句或祈使句中Do放在动词的前边有强调作用.这里表示过街时“一定”要小心.