I am concerned __________ it that I can't concentrate __________ my work because of headache.
| A．of; on | B．of; of |
| C．about; on | D．about; to |
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I am concerned __________ it that I can't concentrate __________ my work because of headache.
| A．of; on | B．of; of |
| C．about; on | D．about; to |
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