1. Sue saw through Jack’s plan at once. => Sue realized at once ……. 2. A new COVID-19 vaccine has been on trial since the beginning of the year. => They ………
2 câu trả lời
1.- Sue realized at once that Jack was planning something.
-Sue realized at once that Jack's intentions weren't so straightforward.
Mình nghĩ được 2 cách
2. They have been testing a new COVID-19 vaccine since the start of the year.
1. Sue realized at once that Jack was planning something. (bn sài thì Quá khứ tiếp diễn là đc nha bn )
2. They have been testing a new COVID-19 vaccine since the start of the year.(chuyển sang thì hiện tại hoàn thành tiếp diễn)
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