Modal Perfect สำหรับการอนุมาน — Bài Tập 5

The climber reached the summit of Everest without supplemental oxygen, a feat few have accomplished. He ___ possessed extraordinary physical endurance.

The final report is full of errors. He ___ proofread it carefully.

The bacteria developed resistance to a brand-new antibiotic in just a few weeks. It ___ have a remarkably fast mutation rate.

The power is out in the whole neighborhood. A transformer ___ blown.

He's shivering. He ___ be cold.

The garden is ruined. The neighbor's kids ___ been playing football here again.

I don't believe his story. He ___ made it all up.

The milk smells sour. It ___ gone bad.

He passed the test without studying. It ___ been very easy.

He's usually so careful. He ___ been really distracted to make such a mistake.