Question

In winter, we must pay attention to _________.

A．keep warm

B．keep warmly

C．keeping warm

D．keeping warmly

Answer 1

C

to在这句话里当介词用，所以后面要用动名词，keep后接形容词表示保持怎么样，接副词表示怎样地保持，根据题意，这里应是保暖，所以选C。