The scientist has had a research weather for more than 30 years.

A. in B. on

C. at D. From

 

B

【解析】

試題分析：句意為：這個科學(xué)家在天氣方面研究了30多年。表示在某方面有特別的研究專長應(yīng)用介詞on。故應(yīng)選B。

考點(diǎn)：考查介詞的用法。

 

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