LASER EYE SURGERIES, ONCE CONSIDERED RISKY AND DANGEROUS,_______ THAT 90 PERCENT OF RECIPIENTS CAN SEE VERY WELL AFTER THE OPERATION

33. - DE THI THU NXB BO GD CO DAP AN
DE THI THU NXB BO GD CO DAP AN
33. Laser eye surgeries, once considered risky and dangerous,_______ that 90 percent of recipients can see very well after the operation. A. which are now so successful B. are now so successful C. they are now so successful D. is now so successful