How many Americans had been killed by AIDS?
举一反三
- It was difficult to ________ how many trees had been destroyed.
- How many years had Rip been asleep?
- 10 It was difficult to __ how many people had been wounded in the earthquake.
- —How many times _______ you _______ to Beijing this year?—Three times. A: have, been B: had, been C: have, gone D: had， gone
- It was difficult to ________ how many trees had been destroyed. A: regarad B: think C: estimate