单项选择题

My doctor said I should vary my diet more.()

A．prepare
B．cook
C．choose
D．change

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单项选择题

Marsha confessed that she knew nothing of computer.()

A．reported
B．hoped
C．answered
D．admitted

单项选择题

Things have changed a lot since I was a child.()

A．greatly
B．gradually
C．suddenly
D．frequently

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