单项选择题

Bob would have helped us yesterday, but he ______.

A.was busy
B.is busy
C.had been busy
D.will be busy
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单项选择题
The school advisers help you talk through your problems but they don’t give you any direct ______.
A.solution
B.target
C.measure
D.function
单项选择题
Yang Liwei showed the flags of China and the United Nations, ______ the wishes of the Chinese people to explore and use space peacefully.
A.express
B.expressed
C.expressing
D.expresses
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