分泌生长抑素的是
A．"铅管"征B．"鹅卵石"征C．"鸟嘴"征D．"杯口"征E．充盈缺损
参考答案：D
—Who is the man over there? Is it Mr. Li?
—No, it _______ be him, Mr. Li has left for Hong Kong. [ ]
A. mustn't
B. may not
C. needn't
D. can't
在途库存
