单项选择题

In the past 50 years, there ______ a great increase in the amount of research on the human brain.

A．was.., did
B．has been.., to be done
C．was.., doing
D．has, been.., done

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单项选择题

I must have eaten something wrong. I feel like ______ We told you not to eat at a restaurant. You'd better ______ at home when you are not in the shape.

A．to throw up... to eat
B．throwing up... eating
C．to throw up... eat
D．throwing up... eat

单项选择题

In addition to bettering group and individual performance, cooperation ______ the quality of interpersonal relationship.

A．ascends
B．compels
C．enhances
D．prefers

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