问题
选择题
—Look at the sign!
—Oh, I see. We ______ waste water.[ ]
A. can
B. must
C. mustn't
D. needn't
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—Look at the sign!
—Oh, I see. We ______ waste water.[ ]
A. can
B. must
C. mustn't
D. needn't
答案：C