Janet Collins' struggle to make place for herself in ballet is the kind of life story ________ afascinating novel might be written.
A. for which
B. in which
C. at which
D. about which
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"I thought you had planned to practice piano today." "I did nothing but _______ letters all day."
A. to write
B. wrote
C. write
D. writing
There were resources such as coal, iron, gold, and copper deep in the soil, but they remained _______.
A. discovered
B. to discover
C. being undiscovered
D. undiscovered
The president's tone of voice was _______ the students knew that the university authorities tookthe incident seriously.
A. such as
B. so that
C. as such
D. such that
下面哪项不属于表面完整性的内容( )
A. 表面形貌
B. 表面缺陷
C. 表面层物理力学性能
D. 表面加工纹理