问题

29If city noises____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
B:are not kept; have to
C:do not kept; will have to
D:do not kept; have to
正确答案是:
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