2. 外语
  3. Observations were made______the children at the beginning and at the end of preschool and first grade.

Observations were made______the children at the beginning and at the end of preschool and first grade.

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问题 Observations were made______the children at the beginning and at the end of preschool and first grade.
选项 A、towards
B、of
C、on
D、at
答案B
解析 这里的of短语实际上应跟在observations的后面(make observations of thechildren)，变成被动态就成了本题这个句子，且由于of的宾语太长，所以后移。
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