符合再生障碍性贫血的是

A. 测定17-羟孕酮
B. 停用利尿剂4周后测定尿钾排泄率
C. 立即测定肾素～血管紧张素
D. 立即给予立卧位醛固酮试验

A. through
B. before
C. because
D. till

A. promised
B. refused
C. had
D. ought

A. They are too busy to spare the time.
B. They have to learn many things.
C. They often have no such interests.
D. They don't know how to make a choice.