IELTS Gold: Unit 4 Grammar Focus Practice (Advanced)

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Scientists ______________ several new planets since advanced telescopes became available in the 1990s. (discover)

have discovered/Present Perfect Simple

The number of international tourists _______ dramatically over the past decade as travel became more affordable. (increase)

has increased/Present Perfect Simple

The company ___________ innovative software that completely changed how people manage their personal data. (develop)

has developed/Present Perfect Simple

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