If people ________ quickly back then, they would have stopped today’s disasters. But they did nothing.
A: had acted
B: acted
C: would acted
D: have acted
A: had acted
B: acted
C: would acted
D: have acted
举一反三
- If people had acted quickly 60 years ago, they would have stopped today's disasters.
- If people had acted quickly back then, they would have stopped today’s disasters. =如果人们那时__________，他们或许能_____________。
- If people had acted quickly back then, they(stop) _____________today’s disasters. But they did nothing.
- If people ____(have) acted quickly back then, they _________(will/have)_________(stop) today's disaster.
- Scientists were warning the world about global warming 60 years ago. If people had acted quickly back then, they ………………………………….(stop) today’s disasters. But they did nothing.