【单选题】The mother___the room___the baby fell asleep.
【简答题】红外光谱的四个主要分区为X-H伸缩振动区、三键和累积双键伸缩振动区、 、和X-Y伸缩振动及X-H变形振动区。
【简答题】V形反转是一种强势反转,在应用时可大胆使用。 ( )
【简答题】V形反转是一种强势反转,在应用时可大胆使用。( )
【简答题】.句型转换(10分) 小题1:The baby fell asleep when its mother came back. (改为同义句) The baby ________ fall asleep________ its mother came back. 小题2:The boy was riding a bike when the UFO landed. (对划线部分提问) was the ...
【简答题】v形反转是一种强势反转,在应用时可大胆使用。( )
【简答题】红外光谱的四个主要分区为 、三键和累积双键伸缩振动区、双键伸缩振动区和X-Y伸缩振动及X-H变形振动区。
【单选题】______the baby fell asleep ______ the room.
A.
After ; did the mother leave
B.
Not until ; did the mother leave
C.
Not until ; the mother left
D.
Soon after ; the mother had left
【简答题】红外光谱的四个主要分区为X-H伸缩振动区、三键和累积双键区、 、和X-Y伸缩振动及X-H变形振动区。
【判断题】V形反转是一种强势反转,在应用时可大胆使用。