皮皮学，免费搜题
登录
搜题
【单选题】
预付款的支付按照专用合同条款约定执行，但至在开工通知载明的开工日期（）天前支付。A.
7
B.
14
C.
21
D.
28
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】What is the problem of Englands emergency health care services?
A.
The ambulances can't take the patients to the hospitals in time.
B.
The health care workers on the ambulances are not well-trained.
C.
The hospitals have difficulty treating patients timely.
D.
The hospitals can't collect the enough medical care expenses.