Question

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

Answer 1

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。