Barack Obama’s first speech as president left a strong impression his audience.

A. on B. in C. at D. by

A

【解析】

試題分析：考查介詞辨析。A在…上面；B在…里面；C在；D通過(guò)。 leave a strong impression on sb，給某人留下深刻印象。句意：奧巴馬作為總統(tǒng)的首次演講給觀眾留下了深刻的印象。故選A。

考點(diǎn)：考查介詞辨析

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