Once a programme ___ put into a computer, it ___ accordingly.A. is; acts B. is being; is acting C. has been; will act D. will be; acts

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Once a programme ___ put into a computer, it ___ accordingly.A. is; acts B. is being; is acting C. has been; will act D. will be; acts

Once a programme ___ put into a computer, it ___ accordingly.A. is; acts B. is being; is acting C. has been; will act D. will be; acts
Once a programme ___ put into a computer, it ___ accordingly.
A. is; acts
B. is being; is acting
C. has been; will act
D. will be; acts

Once a programme ___ put into a computer, it ___ accordingly.A. is; acts B. is being; is acting C. has been; will act D. will be; acts
C

答案是A.
once引导一个条件句,从句用一般现在时。在这种条件句中,主句、有时用将来时,有时用一般现在时。

A

C,事情发生先后,前句用完成时,后句用将来时,前句是指程序被编入,所以用被动语态。

C
once在此作“一旦”讲,引导从句,主将从现