Question

We must do what we can to ____________the river ______________. A．protect; against polluting..

We must do what we can to ____________the river ______________. A．protect; against polluting B．stop; polluting C．keep; being polluted D．prevent; from being polluted

Answer 1

D

试题分析：考查固定词组。固定词组：prevent sb from doing sth阻止某人做某事；句意：我必须坐我们能做地阻止河流被污染。根据句意说明存在着被动的关系，故使用动名词的被动语态。故D正确。 点评：固定词组：prevent sb from doing sth阻止某人做某事；在考查的时候注意与具体的语境结合考虑其主动或者被动的形式。