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Greatcarewastaken.a)byhisbooksb)athisbooksc)onhisbooksd)ofhisbooks为什么不选a而选d

题目详情
Great care was taken _____________.
a) by his books
b) at his books
c) on his books
d) of his books
为什么不选a而选d
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答案和解析
take care of 固定用法‘ 照顾,保管’
.所以是D