This was the first time______I had serious trouble with my boss.
A. since
B. that
C. which
D. when
2009年世界液化天然气贸易量占天然气贸易总量的比重为()。
A. 17.5%
B. 22.20%
C. 27.70%
D. 38.30%
表格中?处应为()。
A. 1598.1
B. 1902
C. 1700
D. 14281
Clothing made of man-made fibers has certain advantages over______made of natural fibers like cotton, wool or silk.
A. one
B. that
C. which
D. what