At times worrying is a normal response to a difficult event or situation --- a loved on

问题补充：

At times, worrying is a normal, response to a difficult event or situation --- a loved one being injured in an accident, for example.

A. effective

B. individual

C. inevitable

D. unfavorable

答案：

A. effective

B. individual

(答案→)C. inevitable

D. unfavorable

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