There is only, ______, random monitoring of gas emission by the pollution control agency.

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问题 There is only, ______, random monitoring of gas emission by the pollution control agency.

选项 A、at best
B、with the best
C、for better
D、on the better

答案A

解析 词组辨析题。at best意为“至多,充其量”,符合句意,故本题答案为A。with the best表示“不比任何人差”,排除;for better后常接or for worse表示“同甘共苦”,排除;没有on the better这个词组。
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