青书学堂: (3). (单选题) They never go shopping together because _______.(本题0.5分)
举一反三
- 青书学堂: (单选题) The atmosphere _______ certain gases mixed together in definite proportions.(本题2.0分)
- 青书学堂: (单选题) 单选20.充分就业是指（ ） (本题5.0分)
- 青书学堂: (单选题) Ron Jackie left school at sixteen because ________.(本题1.5分)
- 青书学堂: (单选题) – Let’s go swimming, shall we? –________.(本题2.0分)
- 青书学堂: (1). (单选题) More and more people are using the Internet because _____. ( )(本题2.0分)