请从所给的四个选项中，选择最适合的一个填在问号处，使之呈现一定的规律性().
A.A
B.B
C.C
D.D
参考答案：D
What the teacher said in class set all the _____ a lot.
A．present students to think
B．students present thinking
C．present students thinking
D．students present to think
醋酸地塞米松结构中含有的基团为( )。
A．乙炔基 B．吡啶环C．二烯醇基 D．α-醇酮基E．β-内酰胺环
