CHUYÊN ĐỀ 2 THÌ ĐỘNG TỪ (VERB TENSES)
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I visit a new country every year. By the time I……….fifty, I……….almost all the countries in the world. A. will be - will visit B. was - had visited C. am - will have visited D. am - visit

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I visit a new country every year. By the time I……….fifty, I……….almost all the countries in the world.

will be - will visit

was - had visited

am - will have visited

am - visit

Giải thích

Chọn C