Scientists think that there _____ life on Earth for millions of years.
A: has had
B: have had
C: has been
D: have been
A: has had
B: have had
C: has been
D: have been
C
举一反三
- In the last few years，there________great changes in the country． A: had been B: were C: have been D: has been
- Every means______tried but with no end. A: have been B: have had C: has been D: are
- He Beijing four times. A: has been to B: had been to C: had gone to D: have been to
- The patient______ in the hospital for a week. A: has been B: is C: have been D: had been
- This is one of the best novels that ______ appeared this year. A: have been B: has C: had been D: have
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This is one of the best products that____sold this year. A: had been B: have C: have been D: has
- 1
We ___ meals three times a day A: had B: have C: has D: have been had
- 2
Nobody knew what this guy ______ all these years. A: had been doing B: have being doing C: was doing D: has been doing
- 3
If the team had been American, it's likely they ______ been annoyed. A: will have B: will C: would have D: has
- 4
By the time she ______________in the gymnastics tournament at the New York Good Will Games, she________________ a dedicated junior gymnast for eleven years. A: competed , have been B: competes, had been C: will compete, has been D: competed , had been