问题
选择题
If city noise _______ from increasing, people _______ shout to be heard even at the dinner table 20 years from now.
A．are not kept; will have to
B．are not kept; have to
C．do not kept; will have to
D．do not kept; have to
答案
A
keep sth. from doing sth.的被动形式；have to可以用于任何人称。