问题
选择题
Mr. Smith stood beside the window, his attention ____ the car outside.
A．focuson
B．focusingupon
C．focusedon
D．beenfocusedon
答案
答案：C
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Mr. Smith stood beside the window, his attention ____ the car outside.
A．focuson
B．focusingupon
C．focusedon
D．beenfocusedon
答案：C