--- Could you tell me_____ ?

---- Certanily. In half an hour.

A．when will the high speed train arrive

B．when the high speed train will arrive

C．when would the high speed train arrive

D．when the high speed train would arrive

问卷答案设计的要求包括（）

A.使答案与问题对应，避免答非所问

B.应当努力设计完备的答案

C.应当努力使每个答案彼此独立

D.答案的设计要简洁明了

E.尽量采用高层次的测量尺度