33．Before she______thethe door, she____what had happened to her computer．

A．walked;noticed

B．walked; had noticed

C．walks; has noticed

D．had walked; noticed

关于混凝土模板及支架拆除，正确的说法是()。

A．梁侧模拆除时对混凝土强度无任何要求

B．拆模时应先拆侧模板，后拆底模板

C．后张法预应力构件的侧模应在预应力钢筋张拉后拆除

D．同种构件底模拆除时对混凝土强度要求相同