问题
选择题
—Listen! Is Professor Johnson giving a report in the hall?
—No, it _____ be him. He has gone to Japan. [ ]
A. needn't
B. may not
C. mustn't
D. cannot
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—Listen! Is Professor Johnson giving a report in the hall?
—No, it _____ be him. He has gone to Japan. [ ]
A. needn't
B. may not
C. mustn't
D. cannot
答案：D
3Mg＋Al2O3