With his attention ________on the job，he didn't even look up when we came in.

A．to concentrate B. concentrating

C．concentrated D. having concentrated

C

【解析】

試題分析：句意：他把注意力都集中在工作上，當(dāng)我們進(jìn)來時(shí)都沒有抬頭。A ．to concentrate不定式表示將來目的 B. concentrating 現(xiàn)在分詞表示主動(dòng)正在 C．concentrated 過去分詞表示被動(dòng)完成D. having concentrated現(xiàn)在分詞的完成時(shí)態(tài)，concentrate one’s attention on “注意力集中,專注”， attention和concentrate是被動(dòng)關(guān)系，故選C。

考點(diǎn)：考查非謂語動(dòng)詞的用法。

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