单项选择题

The urban ambient quality in some cities was improved ______a certain extent.

[A] by
[B] with
[C] to
[D] of
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单项选择题
She ______to Buddhism when she was a little girl.
[A] transformed
[B] converted
[C] turned
[D] changed
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I ______but for the help you gave me.
[A] didn't succeed
[B] wouldn't succeed
[C] hadn't succeed
[D] wouldn't have succeeded
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