This exam is very difficult. Many students are concerned         the results.
A．a(chǎn)boutB．withC．inD．of
A

試題分析：考查固定詞組。固定詞組be concerned about擔心…；句意：考試很難，很多學生很擔心結(jié)果。故A正確。
點評：在固定詞組中要注意形容詞或者動詞與不同的介詞的搭配。
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