28. The officer was very concerned ________ the latest development in the case because he was concerned ________ it.
| A．about; in | B．for; about | C．with; for | D．in; with |
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28. The officer was very concerned ________ the latest development in the case because he was concerned ________ it.
| A．about; in | B．for; about | C．with; for | D．in; with |
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