专四

单选题The urban ambient quality in some cities was improved __________ a certain extent．

A． by
B． with
C． to
D． of

参考答案：C进入在线模考
译文：部分城市环境质量在一定程度上有所改善。
介词用法题。extent表示“程度，范围”时常和介词to连用，例如to a certain extent意为“在一定程度上”，因此[C]为答案。

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