He was working quietly, with all his attention on the task.A. was fastenedB. fasteningC.

发布时间：2020-08-16 10:31:07

He was working quietly, with all his attention      on the task.
A. was fastened
B. fastening
C. to fasten
D. fastened

网友回答

A. was fastened
B. fastening
C. to fasten
(答案→)D. fastened
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