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
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(答案→)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
解析： keep sth. from doing sth.的被动形式；have to可以用于任何人称。