来自庞军的问题
--Doyouremember___toDr.Greenduringyourlastvisit?--CertainlyIdo.(A)tobeintroduced(B)havingintroduced(C)beingintroduced(D)tohavebeenintroduced
--Doyouremember___toDr.Greenduringyourlastvisit?--CertainlyIdo.
(A)tobeintroduced(B)havingintroduced
(C)beingintroduced(D)tohavebeenintroduced
