41. We haven’t visited our hometown for three years.
→It’s three .
42. Because of his absence, we cancelled the trip.
→Because he hadn’t .
43. His plane took off before he got to the airport.
→When he .
44. She sold the old car and bought a new one.
→Before she .
45. He spent 20 minutes walking to the cinema.
→It took
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Sinh Học lớp 12
