呕吐宿食者，常见于
A．幽门梗阻B．颅脑外伤C．妊娠反应D．急性胰腺炎E．食物中毒
参考答案：A
It is ______ to work out this problem. You needn't be worried. [ ]
A. enough easy
B. easily enough
C. easy enough
D. very easily
All the money he had had been ____, so he had to make a living by begging.
A．used up
B．taken up
C．stayed up
D．brought up
