机关在设置本机关公务员具体职位时，应依据的因素有（）
A.公务员级别
B.职数
C.机关职能
D.机构规格
参考答案：B, C, D
— No one was prepared for the teacher's questions.
— We ____ read the lesson yesterday evening. [ ]
A. must have
B. could have
C. should have
D. might have
（）利于分蘖。
A.深水
B.浅水
C.无水
D.冷水
