We have been excavating layers of ash almost six metres thick, which suggests that they________the fire burning all winter.

A．should keep

B．might have kept

C．should have kept

D．might keep

患者，女，25岁，已婚，近半年经来无期，经量时多时少，经期延长或时出时止，此次停经2个月后突然月经量多如泉涌，经色暗有血块，伴小腹疼痛或胀痛，舌质紫暗，舌尖有瘀点，脉弦细或涩。

此病应选方剂（）

A.左归丸合二至丸

B.逐瘀止血汤

C.清热固经汤

D.固本止崩汤

E.参附汤