With his eyes ________ the work attentively, he didn’t know what was happening o

题干

With his eyes ________ the work attentively, he didn’t know what was happening outside.

A．focusing on

B．focused on

C．fixing on

D．to fix on

上一题下一题 0.64难度单项选择更新时间:2013-12-10 08:20:36

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