有肠梗阻症状并出现血便时，应考虑
A．肠套叠
B．蛔虫团肠梗阻
C．肠系膜血管栓塞
D．粘连性肠梗阻
E．肠破裂
参考答案：A,C
I can’t leave. She told me that I _______ stay here until she comes back.
A．can
B．must
C．will
D．may
多胎妊娠
