All possible means __________ been tired.Every possible means __________ been tired.
A: have，has
B: has，has
C: have，have
D: has，have
A: have，has
B: has，has
C: have，have
D: has，have
举一反三
- All possible means ，but not a means an obvious effect。 A: have been tried; has B: have tried; has C: has been tried; have D: have been tried; have
- Every means ______ tried, but in vain. A: have been B: has been C: are D: is
- Every possible means ______. A: has tried B: has been tried C: was tried D: were tried
- Every means______tried but with no end. A: have been B: have had C: has been D: are
- A good deal of money ________ spent on books. A: have B: has C: has been D: have been