Discussion
Direction : Choose an appropriate verb form.
Over the last fifty years, mobiles __________ dramatically.
Answer: C
The correct form is have developed.
'Over the last fifty years' covers a period running from the past up to now, which calls for the present perfect. Here 'develop' is used intransitively, in the sense of 'grow and change': mobiles themselves have developed dramatically. The adverb 'dramatically' describes that change in the phones.
'Were developed' is simple past and does not fit a period lasting until the present. 'Are being developed' describes work going on at this moment, not change over fifty years. 'Have been developed' makes the phones the object of someone's development work, which fits a sentence about who developed them, not one describing how much the phones themselves have changed.
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