He went on with his work () the difficulties.
A.in spite of
B.although
C.out of spite
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