Chengdu No. 7 High School, _____________ in 1905, is home to a great many excellent students.
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A
found
B
founding
C
founded
D
having founded
推荐题目
 We looked everywhere for the keys, but they are nowhere _______.
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A
to find
B
to have found
C
to be found
D
being found
Without facts,we cannot form a worthwhile opinion,for we need to have factual knowledge ______ our thinking.
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A
upon which to base
B
which to be based on
C
which to base on
D
to which to be based on