Once a programme ________ put into a computer, it ________ accordingly.
A．is; actsB．is being; is actingC．has been; will actD．will be; acts
C
因?yàn)闀r(shí)間狀語從句或者條件狀語從句中用一般現(xiàn)在時(shí)或現(xiàn)在完成時(shí)，主句用一般將來時(shí)。
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