2. 外语
  3. Many parents feel they (need to) keep a closer eye (to) their children (because) of concerns (about) crime and school violence.

Many parents feel they (need to) keep a closer eye (to) their children (because) of concerns (about) crime and school violence.

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问题 Many parents feel they (need to) keep a closer eye (to) their children (because) of concerns (about) crime and school violence.
选项 A、need to
B、to
C、because
D、about
答案B
解析 应改为on。keep an eye on对某事密切注意。很多父母觉得，出于对犯罪和学校暴力的担忧，他们需要密切注意他们的孩子。
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