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参考咨询系统的构建原则包括：坚持以人为本、坚持服务至上、坚持分工与协作结合、（）

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为了防止竹简虫蛀和霉烂，在书写之前需要进一步加工处理，这道工序叫（）

He noticed the helicopter hovering over the field. Then to his astonishment, he saw a rope ladder _____ out and three men climbing down it.

A. throwing
B. being thrown
C. having thrown
D. having been thrown

_____ regular training in nursing, she could hardly cope with the work at first.

A. Not received
B. Since receiving
C. Having received
D. Not having received

Arriving at the bus stop, _____ waiting there.

A. a lot of people were
B. he found a lot of people
C. a lot of people
D. people were found