Don't be concerned about your mother's illness; she'll recover soon. A. surprised at B. worried about C. embarrassed at D. angry with
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The sentence implies that the mother's illness is not serious and she is expected to recover soon, so there is no need to worry or be concerned.

Being concerned about someone's illness means being worried about it, not being surprised, embarrassed, or angry.

The word 'concerned' in the question means worried or anxious, so the correct preposition to use is 'about.'

The correct answer is B. worried about.

B. worried about