Question

The cool water stops the burning process，prevents the pain       unbearable and reduces swelling.

A．become

B．became

C．becomes

D．becoming

Answer 1

D

试题分析：考查固定结构。Prevent sb (from) doing sth阻止某人做某事。句意：冷水可以阻止烧伤，阻止痛苦变得更加难以容忍，和减少肿胀。根据句意说明D正确。
点评：prevent的用法很集中Prevent sb (from) doing sth阻止某人做某事；注意在这点上其与另外几个近义词stop, keep的用法。