Tom could _________ in the garage when I came around, which would explain why he didn't hear the bell.
Cấu trúc: could have been doing: có khả năng đang làm gì đó tại một thời điểm nhất định trong quá khứ nhưng đã không làm.
We all agree that she is____________________ student in our class.
He_______________us but he was short of money at the time.
Long ago, women were_________to vote in political elections.
_______ has been a topic of continual geological research.
Supporters of free-market globalization point out that_____________________ .
According to critics of globalization, several developed countries have become rich because of
We must push the piano to the corner of the hall to_____________________ our party tonight.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
It is stated in the passage that____________________ .
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.