单项选择题

We（）on this project for four hours. Let's have a rest.

A. are working
B. have been working
C. worked
D. had worked

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单项选择题

I'm tired out. I ______ all afternoon and I don't seem to have finished anything.

A. shopped

B. have shopped
C. had shopped

D. have been shopping

单项选择题

This area of the park has been specially ______ for children, but accompanying adults are also welcome.

A. inaugurated

B. designated
C. entitled

D. delegated

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