Question

【题目】The workers are busy _______ windows to the new building these days.

A. fix B. fixed C. fixing D. to fix

Answer 1

【答案】C

【解析】

试题分析：句意：工人们最近忙着给新大楼安装窗户。be busy doing sth.忙于做某事，是个固定短语，busy后接动名词形式。故选C。