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 the children),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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