问题
选择题
If city noises ______ from increasing, people______ shout to be heard even at the dinner table 20 years from now. (MET1992 )
A．are not kept; will have to
B．are not kept; have to
C．do not keep; will have to
D．do not keep; have to
答案
答案：A
在真实条件状语从句中，主句应用一般将来时，从句用一般现在时。还 要注意city noises和keep是被动关系