单项选择题

Because of the complexity of the modern machine, most offices require secretaries（）

A. to have specified training
B. specified in traing
C. to train specifiedly
D. training specified

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单项选择题
(36) （）

A. ascertain
B. state
C. alter
D. convert
单项选择题
The boy has admitted to（）the window while playing football yesterday.

A. breaking
B. having been broken
C. break
D. be breaking
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