问题标题：
MrsSmithdidn'tknow____whenherchildrenweren'tathomeAhowshouldshedoBwhatshouldshedoCwhattodoDhowtodo
问题描述：
MrsSmithdidn'tknow____whenherchildrenweren'tathome
AhowshouldshedoBwhatshouldshedo
CwhattodoDhowtodo
苏延辉回答：
选C
斯密斯夫人不知道她孩子不在家时要做什么.
***猫迷英语专家团提供【Real.American.English.】
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