複選題
29.(AB) who
(AC) scientists
(AD) where
(AE) called
(BC) of
(BD) spread
(BE) throughout
(CD) noticed
(CE) began
(DE) germs
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統計: A(63), B(27), C(22), D(9), E(66) #2877909
統計: A(63), B(27), C(22), D(9), E(66) #2877909