2. 专升本
  3. The brain is capable of ignoring pain messages if( )to concentrate on other activities.

The brain is capable of ignoring pain messages if( )to concentrate on other activities.

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问题 The brain is capable of ignoring pain messages if( )to concentrate on other activities.
选项 A、it allowed
B、allowed
C、is it allowed
D、allowed it
答案B
解析
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