问题
选择题
—How often do I need to feed the birds?
—They _______ food every day, or they will be hungry.[ ]
A. must give
B. mustn't give
C. must be given
D. mustn't be given
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—How often do I need to feed the birds?
—They _______ food every day, or they will be hungry.[ ]
A. must give
B. mustn't give
C. must be given
D. mustn't be given
答案：C