单项选择题

Much of the boy's free time ______the Internet.

[A] spends surfing
[B] is spent surfing
[C] spent surfing
[D] is spent to surf

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单项选择题

Their refusal to sign the international treaty was ______by many countries in the world.

[A] announced
[B] denounced
[C] renounced
[D] pronounced

单项选择题

The purpose of installing electric eyes along the main roads is to make sure that all vehicles ______follow traffic rules.

[A] cautiously
[B] dutifully
[C] dubiously
[D] skillfully

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