He went on with his work （) the difficulties.
A.in spite of
B.although
C.out of spite
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She won’t leave （) her friends come back.
A. since
B. until
C. when
“如古代甲骨文自身的骨头的年份、类别等是实物本身的信息，而甲骨文是其自身所承裁的信息资源”是什么信息资源？（）
A. 人脑信息资源
B. 实物信息资源
C. 文献信息资源
D. 网络信息资源
While I （) the bus, it started to rain.
A.was waiting for
B.waited for
C.am waiting for
向上级机关的请示的生效时间是（)
A. 上级机关收到请示时
B. 请求成文日期
C. 得到上级机关批复时
D. 请示的印发日期
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