单项选择题

I am grateful for your（）invitation, and I'd like to accept your offer with pleasure

A．delighted
B．innocent
C．gracious
D．prestigious

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单项选择题
They continued to（）about and enjoy themselves until they became tired

A．stroke
B．stroll
C．stammer
D．string
单项选择题
New data has（）that the damage to the ozone layer is not confined to the southern hemisphere.

A. ratified
B. confirmed
C. assured
D. approved
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