___ the beginning of the meeting, the president made a speech ___ how to reduce pollution.

A．a(chǎn)t; in

B．a(chǎn)t; on

C．in; on

D．on; on

 

【答案】

B

【解析】固定搭配at the beginning of在…的起初。on表示關(guān)于某種問(wèn)題。

 

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