胰腺癌最好发部位是()
A．胰腺头部
B．胰腺体部
C．胰腺尾部
D．全胰腺
E．异位胰腺
参考答案：A
Is _______ three hours _______ the poor boy to come to school on foot?
A．it; that it takes
B．there; that it takes
C．there; when
D．it; that
守恒
