水泥混凝土属于（）。
A、弹性材料
B、脆性材料
C、塑性材料
D、弹塑性材料
参考答案：D
The poems said________by Sean Cannery will be published next year.
A．having written
B．written
C．to have been written
D．having been written
党的三大优良作风
