28. The officer was very concerned ________ the latest development in the case because he was concerned ________ it.
A．a(chǎn)bout; inB．for; aboutC．with; forD．in; with
A

28．A(解析：考查介詞。be concerned about“關(guān)心”．be concerned in “涉及，與……有關(guān)”。選A。)
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