THE PASSIVE / TEST 3 19. Soru

Bu Testin Birincisi yakupgsf

100 %

19.

- Sugar-free chewing gums ......... in the 1950s,
and by the 1980s several brands ........ on the
market.

were introducing/were appearing

were introduced/had appeared

had been introduced/will appear

would have introduced/appeared

have been introduced/would be appearing