问题
选择题
— Do you know ______ for New York last night?
— At 9:00.
A．what time he leaves
B．what time he left
C．what time does he leave
D．what time did he leave
答案
B
考查宾语从句。句意：-----你知道昨晚他何时去纽约的吗？---9点。根据时态排除A和C，而特殊疑问句作宾语语序要改变，故排除D。
元。若其他条件不变，生产该商品的社会劳动生产率