题干
. Everyone in our class was working hard and doing what we could _______ a good college.
A：Enter
B：to enter
C：Entering
D：entered
答案(点此获取答案解析）
B
A：Enter
B：to enter
C：Entering
D：entered
的奥司他韦磷酸盐胶囊剂（商品名中国大陆称达菲·港译特敏福，台湾译为克流感）是市场上唯一的奥司他韦制剂。2009的，由于甲型H1N1在世界范围的扩散，全球掀起一般抢购达菲的风潮。奥司他韦的结构如图；下列说法正确的是