39. Thank you for your help. ______ for your help, I wouldn’t have succeeded in my experiment.
| A．If it is not | B．Were it not | C．Had it not been | D．If they were not |
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39. Thank you for your help. ______ for your help, I wouldn’t have succeeded in my experiment.
| A．If it is not | B．Were it not | C．Had it not been | D．If they were not |
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