________the project in time ,the staff were working at weenkends.a,completing b ,having completed c,to have completed d,to complete

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________the project in time ,the staff were working at weenkends.a,completing b ,having completed c,to have completed d,to complete
________the project in time ,the staff were working at weenkends.
a,completing b ,having completed c,to have completed d,to complete

________the project in time ,the staff were working at weenkends.a,completing b ,having completed c,to have completed d,to complete
D
作目的状语要用不定式
=In order to complete the project in time ,the staff were working at weenkends
为了及时完工,全体职员周末都没休息

为了干嘛是目的,所以用to do something!

The staff为了及时完成任务,周末才工作的,所以to do 做状语从句,也可以the staff were working at weekends to complete project in time. 这里之所以有选项a: completing,就是因为有working,这是一种误导;