If a person takes drugs, they will slow down his thinking and ________ turn off his brain.

A．eventually

B．certainly

C．actually

D．hopefully

下列有关新奥法设计施工的衬砌作法中，哪一个选项是正确的（）

A.隧道开挖后立即衬砌支护 

B.隧道开挖后经监测，经验类比和计算分析适时衬砌支护 

C.隧道开挖后，让围岩充分回弹后再衬砌支护 

D.隧道衬砌后，要使隧道围岩中的应力接近于原地应力后再进行衬砌