单项选择题

Mr.Hobbs left his office，still（）why his secretary had been unhappy recently.

A.puzzling
B.puzzled
C.was puzzled
D.was puzzling

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单项选择题

火车车轮轴属于();

A.转轴
B.心轴
C.传动轴

单项选择题

A provisional agreement is one（）

A.that could benefit both of us
B.that you have finalized the delivery dates
C.that is made with certain conditions
D.then he could get a large discount