–What has happened to Jack?
–He’s had one of his legs _____trying to save a boy from the fire.
A．injuringB．injuredC．being injuredD．to be injured
B
考察固定結構。Have sth done使…被做；injure受傷；結合句意可知B正確。句意：—Jack怎么了？—在努力從大火中救孩子的時候，他的而已條腿受傷了。
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