Most of the older civilizations which flourished during the fifth century B.C.are died out（）.
A: they have died out
B: has died out
C: have died out
D: they had died out
A: they have died out
B: has died out
C: have died out
D: they had died out
举一反三
- This species has nearly________ because its habitat is being destroyed.. A: died of B: died out C: died away D: died from
- Many old customs are gradually ____. A: died out B: dying out C: died away D: dying of
- There was a power cut and all the lights _____. A: went out B: go out C: died out D: made out
- Many a soldier ____ in Gulf war already. A: have died B: were died C: is died D: has been dead
- If they had had much money, the child (__). A: would not die B: would not have died C: could not die D: coulod not have died