( ) the project in time ,the staff were working at weekends.A、Comepleting B、Having completed C、To have completed D、To complete为什么选D而不选C

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( ) the project in time ,the staff were working at weekends.A、Comepleting B、Having completed C、To have completed D、To complete为什么选D而不选C
( ) the project in time ,the staff were working at weekends.
A、Comepleting B、Having completed C、To have completed D、To complete
为什么选D而不选C

( ) the project in time ,the staff were working at weekends.A、Comepleting B、Having completed C、To have completed D、To complete为什么选D而不选C
这句的意思是:为了及时完成这个项目,员工们周末都在加班.
因为主句用的是过去进行时,“正在工作”,说明项目还正在做,并没有完成,所以,选C.
D用的是完成时态,意思是已经完成.不符合句意.

不定式的完成式表示的动作发生在谓语动作之前。
不定式的一般式表示的动作往往发生在谓语动作之后。
此处是不定式做目的状语。“为了按时完成这个项目,......”

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