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