单项选择题

A．They are boiling a cup of water.
B．They are stirring a cup of mud.
C．They are cooking sweet and sour rice.
D．They are writing down the recipe.
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单项选择题
A．The engine of their boat stopped working.B．The were attacked by thunderstorm.C．They ran out of oil.D．They ran out of food.
A．The engine of their boat stopped working.
B．The were attacked by thunderstorm.
C．They ran out of oil.
D．They ran out of food.
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