Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another planet.
A: have been
B: are
C: had been
D: were
A: have been
B: are
C: had been
D: were
举一反三
- 25. In the past ten years , there great changes in our family life. A: had been B: are C: have been D: were
- There great change in our management over the past few years. A: is B: was C: has been D: have been
- In the last few years，there________great changes in the country． A: had been B: were C: have been D: has been
- All of those houses _______ in the past ten years． A: were built B: had been built C: have been built D: have built
- Space vehicles were launched into outer space __________ search of another living planet.