英語
1:If you were to fall from that bridge,it() almost impossible to rescue you.
(1)is
(2)was
(3)would be
(4)would have been
2:He would have become a great marathon runner, if it() for his knee problem.
(1)was not
(2)had not been
(3)has not been
(4)would not have been
3:Thank you for the kind help you extended to me the other day.
I () alone.
(1)can't manage
(2)can't have managed
(3)couldn't manage
(4)couldn't have managed
4:I () happy to see him,but I didn't have time.
(1)will have been
(2)would be
(3)will be
(4)would have been
5:They got two free tickets to Canada;() they'd never have been able to afford to go.
(1)rather
(2)but
(3)however
(4)otherwise
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