Question

Fruit and vegetables are good for us. We need them __________ healthy.

A．keep

B．keeping

C．to keep

D．keeps

Answer 1

C

试题分析：句意:水果和蔬菜都对我们是有益的，我们需要它们来保持健康。这里的谓语动词need，动词不定式来作目的状语，根据句意故选C。