问题

e immune system weakens, it loses the ability ________ illnesses

A:fighting
B:fought
C:to fight
D:to be fought

正确答案是：

同类题型

How old ____Li Ping and Lucy — Sixteen _____old.

The soldier raised his gun and calmly _____ it at the enemy commander, fired. [ ]

The _______ scene in the earthquake-stricken area made some people _______ .

d has made great progressrecently.–- _________, and ________.

___________ —He isAndy’s father.