“Please don't use your cell phones when the plane takes off. ” the air hostess said to the passengers. That is the air hostess asked the passengers ________ use their cell phones when the plane took off.A.not toB.didn'tC.don't toD.to not
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A解析导解：祈使句由直接引语变成间接引语时要依靠两个动词句型，即asked sb. (not)to do…或told sb. (not)to do…．