YDS GRAMMAR REVISION TEST 3 52. Soru

Bu Testin Birincisi missbeliever

100 %

52.

- However, vaccines ......... against all the bacteria that ........ infection, and they are
protective for only a limited time.

aren't protected/caused

haven't protected/are caused

can't be protected/have caused

aren't protecting/were caused

don't protect/can cause