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、is it allowed
C、allowed
D、allowed it

答案C

解析 If后面引导的状语从句完整的形式为：it(the brain)is allowed to concentrate…从句主语与主句主语一致，且谓语动词为be动词，故采用省略的状语从句，省略主语及be动词，直接用动词的过去分词allowed，表示被动。

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