问题
选择题
—Look! Peter is playing basketball in the playground．
—It ___ be Peter. He has gone to Beijing.[ ]
A. can't
B. mustn't
C. might
D. may
答案
答案：A
搜题请搜索小程序“爱下问搜题”
—Look! Peter is playing basketball in the playground．
—It ___ be Peter. He has gone to Beijing.[ ]
A. can't
B. mustn't
C. might
D. may
答案：A
+NaOH 
CH3-CH=CH2↑+NaCl+ H2O，该反应式也可表示为
CH3-CH=CH2 下图是八个有机化合物的转换关系 