题目

Rewrite the following sentences as required（根据所给要求，改写下列句子。每空格限填一词) 1. Mary went to London for a study trip last summer. (改为一般疑问句 )    __________ Mary __________ to London for a study trip last summer? 2. It took Paul half a day to get his car fixed yesterday. ( 对划线部分提问)    __________ __________ did it take Paul to get his car fixed yesterday? 3. Alice has never tasted such perfect apple pie before. (改为反意疑问句)    Alice has never tasted such perfect apple pie before, __________ __________? 4. Could you在实验室里，常用固态二氧化碳的升华（　　）A．吸热来获得高温B．放热来获得低温C．吸热来获得低温D．放热来获得高温