题目内容：
The brain is capable of ignoring pain message if__________to concentrate on other activities.A. allowing it
B. it will allow
C. allowed it
D. it is allowed
参考答案：
答案解析：
单选题：The brain is capable of ignoring pain message if__________to
- 题目分类：英语
- 题目类型：单选题
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A. allowing it
B. it will allow
C. allowed it
D. it is allowed