问题
选择题
When asked about this major traffic accident, the policeman said it should not have _________ if the driver hadn’t been speeding.
A．come out
B．come about
C．come across
D．happen
答案
答案：B
考查动词短语辨析。should have后接过去分词，排除D；come out“出来，出版”；come across“偶遇”；come about“发生”。句意“如果司机不加速的话就不会发生了”。故选B。