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
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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
单项选择题
One of the few things you say about English people with certainty is that they ______ talk a lot about the weather.
A．need



B．must
C．should



D．can
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