29. If 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
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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：考查keep…from doing sth.结构的被动形式。【译文】如果城市噪音不制止，二十年后人们不得不在餐桌上吃饭就得大声喊叫才能听见。